Chemical Forums
Specialty Chemistry Forums => Citizen Chemist => Topic started by: Ashkii21 on March 22, 2005, 06:36:15 PM
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I read an article of mixing a small amount of acetone in gasoline and by doing this the gasoline will atomize better thus improving the fuel economy (mpg) of the vehicle. I know that acetone will dissolve (break bond between hydocarbon polymers (in low pH?)) normal fuel lines.(non-metal) I was wondering if these characteristics will change when mixed with gasoline. I know that gasoline is a mixture of heptane to decane and it also has some other additives. So my real question is: Will the mixture of acetone and gasoline damage the components of the engine made of hydrocarbon polymers? (fuel lines, viton valves/seals, O-rings) And if it does, why?
The link to the article is: http://pesn.com/2005/03/17/6900069_Acetone/
Is there an interaction between acetone and gasoline that will damage the fuel lines at the concentration described in the article? Or is this article like adding snake oil to the gasoline to improve it.
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My guess is, based on experience and intuition, that acetone mixed with gasoline will degrade the fuel lines faster than gas alone. The acetone won't really be affected terribly in its destructive properties toward your hose by the gas other than to serve as a dilutent so it will be slower than pure acetone. Why it does this I'm not exactly sure, but ketones are notorious for swelling polymers, leaching out plasticizers, things like that. It may be doing some of these things.
It is true that a lower flash point fuel will improve fuel economy; this is why cheaper grade gasoline gives you better gas mileage--it's got a lower flash point. However, you can also get 'pinging' in the engine--pre-ignition sparking coming from the gas igniting too early. This isn't good for your car. In addition, if you have a high-performance car, the compression in the cylinders REQUIRES a better grade fuel with a higher flash point to run correctly.
Also remember that acetone is about 5% water, something you don't want to put in your engine. I doubt there is an interaction between acetone and gas that will damage your fuel lines, but you probably don't want to add acetone for the following reasons:
1. Pre-ignition of the fuel
2. Damage to fuel lines from normal acetone properties
3. Water in acetone condenses inside cylinders, or rusts out your gas tank
4. Ketones and other oxygen-bearing organics like ethanol have been known to produce carcinogenic incomplete combustion products in exhaust.
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Interesting subject....I have some questions though.....I did a google search for Acetone in gasonline and came up with these urls:
http://www.lubedev.com/smartgas/additive.htm
There also seems to be a lot of "talk" on the internet about Acetone in Gasoine:
http://autos.groups.yahoo.com/group/pes_acetone/
and
http://peswiki.com/index.php/Directory:Acetone_as_a_Fuel_Additive
My qestion is, are these articles based on solid science?
Thanks,
Stever R.
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Steve & Company....
I have been experimenting with Acetone in over the road vehicles for 10 years now, and I have found that it actuall DOES increase gas milage by at least 20% when used in both carbuerated and fuel-injected engines. I have gotten as much as 39.7% increase in the gas milage in my 93 GMC S15 Jimmy that has installed a 98 Vortec 5.7L 350 V8 motor.
Care needs to be taken when adding it to your fuel supply, though the precautions are not that dire. Just do not let it sit on your skin for a long time. Make sure it gets well mixed into the fuel tank(s). I have not NO discernable degrading in either the stock fuel lines (GM in my case) or aftermarket fuel lines and hoses. This is most likely because the ratio of Acetone Gasoline is very small (about a 640 to 1 mixture or about 0.15 % mixture +/- . very small indeed)
We are currently working on a marketable mixture of Acetone & other ingredients to make it more stable for DOT purposes so it can be made "salable" to the general public.. stay tuned.... the Oil companies will fight it tooth and nail, believe me.
Montana
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How do you deal with the 5% water in acetone? Does it not collect in the engine after a while? What happens to the vaporized water? I'm curious.
In addition, why don't you do this with other highly volatile solvents, such as diethyl ether or the like? Would that not help your mileage, too?
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Hello gwehe amd hmx91213
Thanks very much gwehe for the information. I am going to give the acetone a try. I noticed that a lot of people on the Internet are talking about it now and what you are saying jives with what the lubedev website is saying. I also saw that there is person who is bottling the straight acetone and selling it. :)
hmx91213...I wonder if the amount of acetone used, 3oz to 10 gallons of gas is so small, that 5% water is not going to be harmful? The articles on this website do not mention 5% water as a problem when using acetone.
http://www.lubedev.com/smartgas/
Thanks again,
Steve R.
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I don't think such a minute amount of water would be a problem in an engine. Sure you can't compress, but for a regular its not a big deal. When the exhaust valve opens it'll just crap out most of that water. Having it sitting in your engine while its off isn't the best thing, but if you drive regularly you should be okay. Same problem happens if you have fuel sitting in your cylinders, I know all about this one. Had some leaky injectors, and the fuel sat in the cylinders and killed my piston seals. Well it'll do it over time anyway.
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One wonder if Acetone will act like dry gas and therefore 5% water in the Acetone would not be an issue
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My understanding is that acetone reduces the surface tension of gasoline thereby increasing vaporization and allowing more of the fuel to be consumed during the combustion process. This also is said to reduce emissions. Acetone also increases the octane some so pre-ignition (pinging) should actually be reduced.
Also if you do some research you will find that acetone is a major ingredient in many fuel system treatments.
I have been using acetone for several weeks now but my results are not as great as some others. This may be due to the fact that my vehicle is rather new or due to my driving habbits. In my opinion its not the miracle that many make it out to be, but it does seem to help some. As far as the water goes, 5% water in a mixture of .3% acetone to gas seems pretty small. I would imagine that you get more water in your engine by driving in humid air. I'll try acetone in my wifes van (older w/more miles) and see if that makes a bigger difference.
Just my 2 cents worth (hey, my keyboard doesnt have a cent key!).
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What is the big problem with there being extra water?
I built a water injection system for one of my cars. It pumped high pressure water directly into the intake manifold. Getting water in the engine isnt a big deal. The pump I used was 100psi at 1.3gph. The only problem with water in the engine is hydrolock which is not that easy to do.
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Would acetone act similarly as dry isopropanol?
http://www.faqs.org/faqs/autos/gasoline-faq/part1/
http://www.faqs.org/faqs/autos/gasoline-faq/part3/
8.7 How can I remove water in the fuel tank?
If you only have a small quantity of water, then the addition of 500mls of
dry isopropanol (IPA) to a near-full 30-40 litre tank will absorb the water,
and will not significantly affect combustion. Once you have mopped up the
water with IPA, small, regular doses of any anhydrous alcohol will help
keep the tank dry. This technique will not work if you have very large
amounts of water, and the addition of greater amounts of IPA may result in
poor driveability.
Water in fuel tanks can be minimised by keeping the fuel tank near full, and
filling in the morning from a service station that allows storage tanks to
stand for several hours after refilling before using the fuel. Note that
oxygenated gasolines have greater water solubility, and should cope with
small quantities of water.
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In 100% acetone there is NO WATER.
I don't think these people are talking about acetone-water mixtures. It's PURE acetone they're talking about.
However, I don't know if MPG is increased - might try it out though.
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Acetone readily absorbs water from the air. If the container is sealed it will not absorb water. Some plastic containers will allow slow transmission of water through the wall but if it is not stored in the plastic container for a long period there should be no problem. Water has 100% solubility in Acetone and vica-versa. It should absorb separated water in gasoline just like alcohol does without separating out itself.
I don't know why a little water in the combustion chamber is a concern anyway. One of the main combustion by-products is water. There is more water produced in the combustion process than could be introduced by adding such a small amount of Acetone.
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Isn't water vapor the most abundant gas in our atmosphere?
Even on a dry day in a dry climate there will be far more water passing through an engine from air than there could be from any miniscule amount that there might be in acetone or any other reasonably pure source of fuel. I was introduced to acetone as an indusrtial solvent/degreaser in 1978. I have great respect for it's volatility and an appreciation for it's power as a solvent. We dispensed it with plastic spray bottles like the ones we are familiar with for houseplants. It doesn't react with all plastics as readily as some may think. Some plastics will be ruined or dissolved instantly while others will be virtually unaffected. Of course the materials used in automobile fuel delivery systems are chosen for resistance to solvents as well as other factors. Just for S&G I have a small piece of 3/8" reinforced fuel line hose and a piece of 1/4" neoprene hose soaking in straight acetone to see how it may be affected. I had no reservations about trying a 640:1 ratio. I added 3 ounces of acetone to a full tank of gasoline (15 gallons) on Monday, (5 days ago). I can't speak for mileage yet, but engine "ping" was completely eliminated the first day. Other than "ping", performance isn't noticeably better, but it certainly isn't suffering either. (I'm running a 1987 Buick Century with the 2.5 litre "Iron Duke" 4 cylinder, 223000 original miles, I don't really expect much other than dependability.) My around town mileage has been constantly between 23.4 - 23.8 MPG, slightly less in winter. I've been keeping track of my gas mileage as long as I've been driving, if there's a difference I should see it with the first tank of gas, but I won't be convinced until I see repeated results. I'll report any increase or decrease, but it might be a while, I only put on about 75 - 100 miles per week.
;D :beer:
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Isn't water vapor the most abundant gas in our atmosphere?
No.
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I stand corrected, I missed a word. Water vapor is the THIRD most abundant gas in our atmosphere. That's a considerable amount of water passing through our internal combustion engines. A miniscule amount, in solution, in fuel isn't anything to worry about. It's when it isn't in solution that problems occur.
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Hello gwehe amd hmx91213, feel free to disagree.
Okay. Isopropanol is an alchohol, what's the problem? None that I can see. Except it costs as much as Gasoline.
The point about the surface tension is the biggest thing to consider here with any fuel additive of Alchohol or Acetone and Naptha's. The raised vapor point increases your effective compression, the lowered "octane" rating or specific heat value is then offset by the increased burn rate.
Does that make sense alright?
Plus consider that all vehicles made since the late seventies have rubber fuel lines impervious to alchohol and butanol additives. They won't leach and they won't dry in these conditions. Plus these additives are sometimes the same components of Fuel Injector cleaner made by people like STP. Not such a concern really. I'd rather have the Isopropanol in a Diesel to collect the water in the tank, but it would do the same for gasoline too. Who wants their tank to rust out, or their fuel to freeze? Either can happen in some areas.
If you think that idea was odd consider this one. Drop two Napthalene mothballs in your motorcycle tank at fillup and notice the power increase. I know why it works and how.
Think it over and you'll know why it does that now too..
Andy
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OK, first result here. I mixed 3 ounces of acetone into a full tank of gasoline, (15 gallons). My typical mileage has been just above 23 1/2 MPG. Mileage from the tank before I used acetone was 23.84 MPG, mileage from the tank with acetone mixed in was 23.95. Such a slight difference could be caused by a number of things. I'll run a few more tanks with acetone mixed in and watch the mileage, but I really don't expect to see a significant difference in mileage or performance.
If anyone else tries this, please share your results.
Thanks.
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Don't bother wasting your time. Acetone won't give you improved fuel economy. They don't have an army of PhD physicists, engineers and chemists at Shell, Exxon, Chevron and Valero for nothing. If there was a "smoking gun" additive that significantly improved fuel economy, it would be part of a patented additive package. There are hundreds of different chemicals in gasoline (see an Agilent chromatography catalog). This idea falls into the "something for nothing" concept (winning a lottery, being a movie star etc) that so many Americans want and never get.
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Dude you raise some good points. Except those Dr.'s are concerned with the fuel being made in the refinery. What about after it has sat in one of those massive Tanks at a tank farm for months or years?
They make more than they will use for a short term, then they have a little extra if they need to do some work and shut down for a while. These tanks will draw moisture and stagnate the fuel a little.
It doesn't really help that much though and you're right. It would be much wiser to just buy HEET, Octane Booster, or Injector cleaner and use that instead simply from the standpoint of warrantee also.
We did some experiments with Water injection in College using a heated steam vapor injection system in an old 74 Toranado with a 455 in it. The mileage increased from 5% to 15% depending on how we drove it in the mountain area.
The addition of these types of additives would've helped it in that system. But any experimenting would be up to the person who owns the vehicle ultimately.
I've never gotten better mileage from any additive, but would get more power for minimal loss in economy. To raise the economy you would need to add more than 1 pint in 20+ gallons of fuel. The percentages of dilution are just too small otherwise.
Andy
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I just filled up again. 350.2 miles, 14.80 gallons, 23.66 MPG.
That was the second tankfull I ran with 3 ounces of acetone mixed in. No difference at all in mileage, and if there was a difference in performance other than a reduction in "ping" I really didn't notice it. I'm certain that the acetone did no harm to any components of my engine or fuel delivery system. I still have the 2 pieces of hose submerged in acetone and they don't look or feel any different than they would if they were soaking in water. I guess my final word, based on my experience is this: It didn't help, it didn't hurt, but now I know from firsthand experience and I don't have to wonder.
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Just curious –
What was your source of acetone?
Do you think that a can of Drygas (isopropyl alcohol) at each refueling would have the same reduction of ping effect?
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Sorry for the delay, bunch of stuff happening lately, haven't been on the computer much.
My acetone came from the paint/hardware department at K-Mart.
I don't have an opinion about alcohol and ping reduction, I guess I could give it a try. It certainly shouldn't hurt anything and it won't cost much to find out.
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The small amount of water in the acetone has no significance to the fuel will not put any rust in the engine. I used to have a '73 Charger with a 318 high performance engine. It got 9 mpg no matter how I drove it. Unless I was really rapping it. I installed a water vapor injection system on it (home made), and increased my mileage to 14 mpg and noticable increase in performance. The mileage still went away if I got into it. Water vapor has more power than the gasoline when it turns to steam. I did not use a pressure system like one of the previous postings however. On most vehicle, drivers will notice on a high humidity day an increase in performance as opposed to a hot dry day. When an engine is torn down after a vapor injection system is used for a while, the engine will be cleaner in the cylinders and around the valves, due to the high pressure steam washing action. I have used this on other various vehicles including an 82 Ford Courier where amongst other various things done to it, got the mileage up to 45 mpg. This was not every tank, but was up into the mid 30's repeatedly. It took alot of work to keep the high mileage. As for acetone and alchohol, I tried various mixtures with alchohol in both the vapor system and the fuel. Alchohol seemed to have no appreciable effect negative or possitive to the mileage. Acetone had a slight increase in mileage, but not any noticable increase in performance. It's kind of funny, but this is just coming out about acetone and I knew about this from experimenting back in the mid '70s. One thing that we used to do back then was to put a handful of moth balls in the tank at fill up. Most mothballs are made of naphthalene. They would dissolve in the fuel and increase the performance by up to about 10%. I WOULD NOT recommend putting mothballs in a fuel injection system. The have a REAL potential of messing up the injectors. Also too many will cause the fuel to burn too hot and put holes in your pistons not mention causing pinging if the timing is not altered. If you want an increase in mileage, nothing is free. You can experiment with the acetone, but keep the ratio low, because over time it will cause deterioration to many fuel lines with the addition of heat and pressure as opposed to just sitting in a can of gas/acetone mixture. People seem to forget about the heat developed from the vehicle and the high pressure in the fuel system. Your best bet is to put a good ignition system in along with a good water vapor injection system. There are plenty of them on the market. Buy a good set of Split Fire or similar plugs and not platinum. Platinum is good for heat but no good for hotter spark. The hotter the spark, the better the burn. Look at the top fuelers. You could almost weld with those ignition systems. Good Luck, DP
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It's a dry fuel. Burns completely. And is relatively cheap and abundant.
Sure the funny cars blowup after a few runs, but so do the Gas engined cars - it's the way they want them to run.
I think with a good turbo or supercharger they could run NitroMethane or NitroMethanol quite well.
Andy
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Buy a good set of Split Fire or similar plugs and not platinum. Platinum is good for heat but no good for hotter spark. The hotter the spark, the better the burn. Look at the top fuelers. You could almost weld with those ignition systems. Good Luck, DP
Hotter spark plugs are not needed on normal street engines. Hotter or higher energy spark plugs are needed on high performance engines because of the higher compression ratio. A normal spark plug will have a hard time firing in an high compression engine. Top fuelers are pumping so much fuel and air in the cylinder they almost need an arc welder to get the plugs to generate a spark. If you use too high a heat range spark plug on a standard street engine, you can induce pre-ignition.
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A hotter spark can be used without causing spark knock. Only on one vehicle (street vehicle) have I ever had a problem with pre-ignition due to hotter ignition and that was solved by changing the timing slightly. Not enough to alter performance, but enough to stop the knock. If you have a newer engine with knock sensors the computer should alter the timing sufficiently to stop the knock. Water vapor acts similar to higher octane. It will slow the burn down like your EGR system does to help prevent pre-ignition. Steam has more power than gasoline, however under normal conditions, the energy to produce the amount of steam needed to push a piston is more than the gas being burnt in the cylinder. If a small amount of water is introduced with the burning fuel you can increase the efficiency of the fuel by using less fuel and a little steam to make up the difference. Too much water vapor and you will defeat the flammability of the fuel and cause a hydro lock like a previous posting stated. My point on the spark plugs was not to get a welding arc going, but to get a multiple spark. The point of this subject of acetone and gasoline was to get better burn from the fuel for better economy. A multi-spark will create a more efficient burn. With the exception of one vehicle, I had an increase of 3 to 7 mpg. I am not including the Ford Courier pickup, because it had many other alterations. There are many high-energy ignition coils that are sold freely for street engines. An advanced ignition module like MSD can give a multiple spark. Nissan uses multiple plugs on some of their engines (I don’t know why though, it never gave them an advantage, try running the engine without either one set of the plugs firing and see what happens). The bottom line: I tried acetone myself on several vehicles and the gain was not enough to justify the use of it and the potential deterioration of fuel lines over time even though acetone is cheap in comparison to the other things that can be done. That’s not to say that someone else won’t have better success than myself. Little things can be done to most street vehicles to gain some mileage. If you want to get the maximum efficiency from gasoline, your going to have to vaporize the fuel, store it in a holding tank on the car, and then feed it in through a propane regulator and carburetor. (Not a very safe way to get your maximum efficiency, but it can and has been done.) DP
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Actually to all:
The vapor/surface tension "thing" just doesn't hold up for about 12.5 reasons (basic, surfactant chemistry). :"They" had the same "discussion" back in the 80/90s when gas was expensive (supposedly) and catalytic converters and oxygen sensors were starting to come in to use.
FYI: The acetone is reacting with the catalyst used in the oxygen sensor making the mixture appear" too rich. As a result - the mixture is leaned out by the computer thus the mileage goes up.
The reason it does not work the same on all cars is that there are three different metals used as catalysts in O2 sensors: platinum palladium rhodium or in combination. Acetone in combination with NOx (and others) in the exhaust will react differently with each metal to either speed up or slow down the catalytic reaction of the oxygen senor. FYI, I am not talking about the catalytic converter - just to stop about 100 posts.
Question: am I the only one on the planet who remembers this? There seems to be a lot of people skiing behind the "vaporization" boat?
The reason I know this is that I used to work for Exxon; and fyi, the reason they don't put acetone in gas is that it is hard to get it to stay there and second over time it reacts with different kinds of additives in fuel. Which is also a reason why it does not work on some cars - it's the gas not the car.
They have had additives in the past with acetone - old news. It is good that it works though! It simply had gotten more news because of the historic price of gas.
Also, this is why ASME standards for elastomers used in cars requires (heavily suggests) that all elastomers be tested with acetone - along with other (i.e . MTBE, M85 ...) Once again, very old (but good) news (remembrances)
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That's pretty cool, and that is some good knowledge.
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My concern is the "wiping" effect of the acetone. being acetone is probably the best oil/grease remover, cleaning solvent available to the "consumer". This "wiping" effect may dry out bearing surfaces, like: cylinder walls, valve stems, etc. People used to try using #2 fuel oil in diesels engines to cut cost, only to be hit with a worn/burned out top ends of the engine, the cause: the diesel fuel has paraffin mixed in it, a wax to help lubricate the wear surfaces in this type of high compression engines.
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I just have to throw my $0.02 in:
Acetone has the following compatibility ratings (Excellent - compatible, severe effect - incompatible)
PVC: Poor
Teflon: Good
ABS: Severe Effect
Polypropylene: Fair
Ryton: Good
Viton: Poor
Buna N/Nitrile: Poor
Neoprene: Poor
Ethylene Propylene: Fair
Fluorocarbon: Poor
You can usually inject up to 30% water into your internal combustion engine to improve combustion.
Acetone precipitates paraffins, so if you have any of this in your fuel fraction, you will have paraffin particles on the bottom of your fuel tank to plug your fuel filter.
Take care everyone,
Eugene
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I read this article and have decided to try to add acetone into gasoline to improve a gas mileage for my 1998 Ford Taurus with 127,000 miles on it.
These are preconditions I had for my Taurus: I used gasoline with 89 octane number containing up to 10% of ethanol. Changed engine oil regularly every 3,000 miles. Driving mostly in city. Gas mileage before experiment was 16 MPG in city and 28 MPG on high way.
Before performing experiment I did change the following: fuel filter, air filter, and tuned up spark plugs. I would like to make it clear, that my purpose was to IMPROVE GAS MILAGE, so I did not care about careful distinction between effect of acetone and effect due to tune up. Obviously (according to all the recommendations and manuals), changing filters and tuning up spark plugs should increase gas mileage.
Filling gas for a first time:
When about 2 gallons of gasoline left in my gas tank, I have added 2 fl ounces of acetone and added 6 gallons of gasoline. NOTE: I did not pure acetone directly into the tank. Instead, I have performed pre mixture of acetone and gasoline in 20 ounces plastic bottle, then on gas station BEFORE filling my car I poured gasoline-acetone mixture from 20 ounces bottle first and then filled with 6 gallons of gasoline.
INTERMEDIATE RESULT 1: on these 6 gallons I made about 96 miles which is 16 MPG.
INTERMEDIATE CONCLUSION 1: tuneup and filter changes together with acetone do not improve gas mileage. May be if tuneups improve gas mileage acetone decrease gas mileage giving no total effect.
I did not give up (and in order to improve statistics) I continued.
Filling gas for a second time:
When about 2 gallons of gasoline left in my gas tank, I have added 1.2 fl ounces of acetone and added 6 gallons of gasoline.
INTERMEDIATE RESULT 2: on these 6 gallons I made about 105 miles which is 17.5 MPG.
INTERMEDIATE CONCLUSION 2: OOPS!!! Gas mileage of my car increased!
With this encouraging result I continued.
Filling gas for a third time:
When about 2 gallons of gasoline left in my gas tank, I have added 1.2 fl ounces of acetone and added 6 gallons of gasoline.
INTERMEDIATE RESULT 3: on these 6 gallons I made about 114 miles which is 19 MPG.
INTERMEDIATE CONCLUSION 3: Gas mileage of my car keeps increasing!
Filling gas for a fourth time:
When about 2 gallons of gasoline left in my gas tank, I have added 1.2 fl ounces of acetone and added 6 gallons of gasoline.
INTERMEDIATE RESULT 4: on these 6 gallons I made about 120 miles which is 20 MPG.
INTERMEDIATE CONCLUSION 4: Looks like gas mileage of my car is reaching saturation point, and overall GAS MILEAGE INCREASED from 16 to 20 MPG, which is a very good result as for me.
I did not change my driving style. I did fill gasoline at the same gas station (Conoco by the way). I did drive all these miles in city with no single mile on the interstate and with highest speed of 40 MPH.
Why do I observe gradual increase in MPG? I am observing that as percent of ethanol in gasoline decreases the mileage increases. Thus, after first gas filling, there where 10% of ethanol in 2 gallons of gas = 0.2 gallons of ethanol in tank and 1.8+6 gallons of gasoline. After second tank filling there where 0.05 gallons of ethanol in tank, after third one 0.0125 gallons of ethanol and after fourth time there where 0.0031 of ethanol, etc.
GENERAL CONCLUSION: To improve your gas mileage I would suggest replacing a gasoline filter, air filter, oil and oil filter according with maintains schedule. Try to use gasoline with no ethanol added and see for MPG results.
If you decided to add acetone into your tank you can give a try, but you should remember there is no guarantee and all responsibility is lying on your shoulders. Personally, I do not have any evidence that allows to claim that ethanol in such a small concentration (2 ounces of acetone per 10 gallons of gasoline) is able to damage engine of your car or destroy or damage rubber rings in your fuel system. Remember, gasoline by itself is a very good thinner and if a gasoline pipe is designed for a gasoline it should sustain such a small amount of acetone as well.
REMEMBER: If you are planning to add acetone into your tank always premix acetone with gasoline in separate container to decrease acetone concentration.
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I don't know who all the self claimed organic chemists are to "dead wrong" broad claims.
I've got a 2 valve 3.9L 6 cyl Dodge dakota, and I've been getting 20% minimum increase in mileage, mild turbo enhancement performance, and faultless performance.
Its got 200K miles, but I take care of it and did front end, tire pressure, shocks, plugs, wires, and 10 gal per fillup like kipkey on You Tube, "double your gas mileage! 2X!".
PLUS I tried a range of oz per 10 gal gas, and the best mileage was what kipkey suggested: 1 oz per 10 gallons or 1/13th of a percent!
My biggest gripe is I've got 16oz in Ace Hardware metal container with a screw top, not even opened, and I need to move it out of my cab (it increases pressure, expands at 86F!!)! I would not trust the stuff in my trunk if I had a car! However, I will build a box to carry my small ammo can in the back of my truck. ITS THAT GOOD OF A THING! I've simulated it driving about 130 miles per day 5 days a week for 2 months so far.
Its been flawless. Just don't repour or contaminate pure solvent, and ace is the only metal pint with a screw top. It is just that strong chemical smell will make you nod out at the wheel. A small lock box near the rear on the side of my gas tank should do it, which I can put my ammo can inside.
And do your maintenance! You will enjoy it. Even Lapointe has a high mix ratio. Kipkey was right on with the 1 oz per 10 gallons. I got a 100% on my Informative speech at school today, and I do have 2 previous GA Tech engineering degrees :-)
Power to the People!!