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Article:Truth About Acetone and Ethanol

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Steve D. Gage gives the logic and data behind his conclusion that vehicle fuel efficiency can be improved 50% by adding 1 oz acetone per gallon and tricking the car's computer into detecting an excess of oxygen so it richens up the mixture.

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This page is presented for the sake of research and development by those who are equipped to properly understand, implement, and test such things. Steve Gage cautions that not all cars are capable of richening enough to utilize acetone safely. Too lean fuel:air mixture will damage engine. Determine first if your engine can and will richen, before adding any amount of acetone to your gas.



Originally authored by Steve D. Gage

A report of independent testing done January through June of 2008.

My thanks to Mr. Louis LaPointe, who was brave enough to begin the Internet controversy over the use of alcohol and acetone as fuels or fuel additives. I am reporting the data I have uncovered and tested in the last few months, which gave DRAMATIC results.

Point 1

NOTE: See Addendum, below, for corrections to this article.--Behindbarsbimbo 09:21, 22 February 2010 (PST)

  • Both acetone and ethanol molecules contain one atom of Oxygen and 6 atoms of Hydrogen. They are both considered as "Oxygenated" fuels, because of the Oxygen atom in both.
  • Ethanol is mandated by the Federal Government to be used as an additive to gasoline, to lower emissions. The decision as to this being done, and at what percentages of ethanol to add is left to individual states.
  • It is a fact that ethanol does in fact lower emissions. The explanation for this effect being the Oxygen atom in the molecule.

Point 2

  • Both Acetone and Ethanol have incredibly high EVAPORATION rates. Gasoline has a low evaporation rate in comparison.
  • All liquids evaporate, at different rates. Even water evaporates.
  • When a liquid evaporates, it COOLS the air it is in contact with. This is why when on a hot summer day, if you get close to a stream or river, you will feel the air temperature drop, near it.
  • When air is cooled, it CONDENSES.

Point 3

  • Via the EXTREME cooling of the air going into the intake of an engine, by both Acetone and Ethanol, MUCH more air in pounds is taken into the cylinders. Condensation of air means more is compressed into each stroke of intake.
  • This results in a LEANER mixture of fuel:air in the combustion.
  • This leaner, highly Oxygenated mixture is what actually causes a drop in emission Hydrocarbons and CO.
  • Documentation: 3 emissions tests on Honda Accord - note approximate 4000% increase in O2 content when Acetone was added. As well, that first two tests failed but last one,

with acetone, passed.[1]

Point 4

  • Simply adding either Acetone or Ethanol results, via the leaning effect, in worse and worse MPG, the more you use.
  • The idea that simply using ethanol is good for the environment, and creates less emissions is INCORRECT. The common and strongest ethanol fuel on the market is known as "E85". It is 15% gasoline and 85% ethanol. Yes, it reduces emissions, via the leaning effect, BUT GIVES *20% LESS MPG than gasoline, thus giving an overall reduction in emissions PER MILE which is near null.

Point 5

  • Acetone has a much greater condensation of air effect than Ethanol, thus MPG drops MUCH faster as percentage added is increased.
  • The negative effect on MPG of both Acetone and Ethanol, can be REVERSED, to cause an INCREASE in MPG over gasoline, with acetone being needed in much smaller amounts than ethanol and at much less cost.

Point 6

"The Secret"

Test results from January to June, 2008:

Test car: 1985 Ford T-Bird 5.0L V8 EPA rating 15 MPG city and 22 MPG highway.

Emissions test using pure 87 octane gas resulted in Hydrocarbons of 190ppm at idle. Fail is 220. O2 was 1.5%. This was suggestive of a small exhaust leak, which the O2 sensor read and richened fuel:air mixture a little too much.

Emissions test using 1 oz. Acetone to 1 gal. gasoline resulted in Hydrocarbons dropping to 111ppm at idle. O2 at 1.5%.

Highway test with this mixture resulted in 23.5 MPG. According to data on the internet, at this very high amount of acetone, MPG should have dropped far below factory. That it actually got slightly better than factory gave away the secret. The slight exhaust leak had richened the mixture of fuel:air and caused a SLIGHT utilization of the acetone.

I saw that the O2 sensor played a part in my results. What I did next was create an INTENTIONAL slight exhaust leak, in front of the sensor to increase O2 in exhaust, to cause computer to richen even more. [leak causes sucking in of fresh air].

Emissions test resulted in increase of Hydrocarbons from the previous 111ppm to 144ppm at idle. O2 went from 1.5% up to 5.2%
Noticeable increase in HP of at least 25%.
Multiple hwy. tests revealed 45mpg.
This is slightly more than a 100% increase over factory.

Tested at .7 oz. per gal. went down to 41 MPG.

Tested at 2 oz. per gal. went down to 30 MPG.

By process of elimination, the best acetone mix for my current fuel:air richness is around 1 oz. per gal.

The secret, known to racing technology, banned and forgotten a half a century ago, is that such fuels as acetone REQUIRE richening of the fuel:air mixture to make use of them. It is said that in those early days of racing, some used as much as 10% acetone additive. I am using less than 1%. Specifically 1:128.

With my emissions at slightly cleaner than gasoline, but my MPG at double what it was, a REAL REDUCTION IN EMISSIONS has been achieved. Fully 50% reduction.

The recent G8 summit set the goal of reducing emissions by 50% by the year 2050. President Bush has signed in to law the requirement for vehicles to get 37mpg by 2020.

We have the technology RIGHT NOW to achieve this IMMEDIATELY.

Reprogramming auto computers is already possible and programs and devices are on the market to do so.

A simple solution for the do-it-yourself mechanic, until the use of the technology becomes affordable and the additives are at the pump, is to TRICK your O2 sensors into making the computer richen. This can be done by either creating an exhaust leak in front of the sensor or by removing the sensor from the exhaust and letting it read pure atmosphere, which is 20.9% O2. The latter will richen mixture to MAXIMUM allowing the most acetone possible and the most HP AND MPG. I have not tried the latter and do not know how well it would work or to what level of increase in HP and MPG might be possible. Try this at YOUR OWN RISK.

Note: New vehicles will FAIL EMISSIONS TESTS if too much O2 is reported by the computer. So make your exhaust leak sealable and reseal it for your test. If you remove the sensor, simply replace for the test.

Environmental impact of acetone is far less than an oil spill.

See: Acetone Environmental Effects

[The Acetone] brand I used is Kleen Strip. I have tested no other brand. Bought by the gallon, price is about $17.00


See Discussion page

HP up -- It's Drag Race Time!

On July 26, Steve Gage wrote:

As for how I know HP is up around 25%...this should make you smile... I know so from drag racing other cars around town. LOL, I'm 51 years old, and havn't had a car this fast since I was 19...can't resist putting my foot in it. No tickets yet, LOL. I haven't raced in years, as 51 year olds are supposed to be responsible enough to obey the law...which I did until I got the HP up in it. Shame on me! :-)

Why You Richen

On July 26, Steve Gage wrote:

Acetone increases O2 intake from aptmosphere. You must richen to utilize it. Then at hwy speed, rpms are around 2400 in my V8 but I have to step on throttle LESS to maintain it as HP is more than it was before.

Programing Devices Available

One good site I found is[2] Devices that give YOU control of your car's computer, including ability to richen mixture.--Behindbarsbimbo 08:54, 6 Aug 2008 (EDT)

Realistic Milage Increase Potential

The test car used was a 1985. There is no way to directly reprogram the computer. Thus, the exhaust leak 'trick' was the only way. Car is only able to make use of 1 oz. per gal. On both older cars with carburators and newer cars, that can be reprogrammed directly, with devices, such as at, it is likely that a much richer setting can be achieved, allowing use of much more than 1 oz. of acetone per gallon of gas. Potential gains in MPG may be as high as 400% increase. --Behindbarsbimbo 14:41, 6 Aug 2008 (EDT)

Photo of Test Car

1985 T-Bird [3]

Sept. 4, 08. 400% EPA MPG Accomplished

--Behindbarsbimbo 15:01, 4 Sep 2008 (EDT) Increased to 1.25 Oz. Acetone per gallon of gas. Increased 02 percentage to sensor from 5.2 to 6.1. Highway test revealed 89MPG. EPA factory is 22MPG. 400% EPA factory is 88MPG. Hydrocarbons up from privious 144ppm to 186ppm. Fuel/air richening was obviously accomplished. Burns dirtier, BUT at DOUBLE the previous 45MPG, and QUADRUPLE EPA factory 22MPG. Fail in Idaho for a 1985 is 220ppm. Passed wonderfully. With it's 20 gallon tank, hwy. range is now 1700+ miles per tank. NOTE: Ran 89 octane gas this time. With the near 1% acetone mixture, adding to that, should be about 90 octane. As more acetone is used it is likely compression pressure goes up. Higher octane seemed to be a good bet, even though I had no octane knock with the 87 octane gas.

Targeting Big Rig Diesels

--Behindbarsbimbo 13:46, 1 October 2008 (PDT) It is Documented[[4]] at this site, that the use of acetone has a positive effect on big rig diesels. Considering that it is the big rigs who use the majority of all petroleum consumed in the U.S., This should be a target area for this technology. Like new autos, big rigs are also computer controlled. But computer altering progams and devices can be designed, just as they have been for gasoline autos. There is even now, adjustable O2 sensors available on the net, for autos. Big rigs are the obvious target area that would do the most good toward reducing emissions, dependence on oil, price of transportation of goods and thus PRICE of goods. Lowering demand for diesel would also drop the price of oil itself, and thus gas and diesel. Increasing the acetone level to 1 oz. or more, per gal. of diesel, while at the same time richening the fuel:air mixture, to compensate for the added intake of O2, caused by the acetone, could very well Double the typical 6 or 7 MPG they get to 12 to 14 MPG. This, a 50% increase in efficiency, if done by all big rigs, would decrease U.S. emissions and oil consumption dramatically. Perhaps, even making the U.S. independent of foreign oil.

October 7. DO NOT put Acetone in E-10 [gasohol]

Five tests done using E-10. Test 1: Baseline - pure E-10, 89 octane gave 22.2mpg hwy. Test 2: Chipped ice in metal air cleaner around filter gave 28. Test 3: Block of ice in front of air intake gave 57.9mpg. Test 4: Block and 1oz. acetone per gal. DROPPED TO 27mpg Test 5: 1oz. acetone per gal. no ice. DROPPED TO 17.5mpg Testing with ice on E-10 at: Article:Ice_Gives_More_MPG --Behindbarsbimbo 11:06, 7 October 2008 (PDT)

Verification video of road test

Video of road test of test vehicle, with aproximately 1oz. per gallon acetone. Video: [5] --Behindbarsbimbo 08:01, 22 February 2010 (PST)

Conspiracy against use of Acetone? July, 2009

The use of gasoline with 10% Ethanol, known as E-10, has become so common in the U.S., that many states now have NO PURE GASOLINE available at all. It is now known that E-10, if acetone is added, will give WORSE mileage than factory. I was incorrect in that Ethanol evaporates anywhere near as fast as acetone. As well that Ethanol can create the same effect as Acetone. It is interesting to note that the nation wide switch to E-10 began immediately following the public statement on July 15, 2008 by the chairman of the Federal Reserve, that high gas prices were driving down consumption. This timing also coincides with my conversation at the yahoo group pes_acetone and with the local media about having achieved 45mpg hwy. from a V8 full size car, with acetone additive. Sterling Allan had been asking me to write an article, here, on this technology. The timing of the date I wrote this article, above, matches within 4 days of the action of the Fed, on July 15, 2008. My point being that the switch to E-10 prevents the use of acetone to REDUCE CONSUMPTION. So here we are a year after I wrote this article, with CONSUMPTION and PROFIT for those who benefit, very much to their liking. Use acetone now, in E-10, and your consumption will increase, not decrease. Pretty good trick. And let us not forget that the use of GRAINS to make the Ethanol has caused the prices of food to increase. --Behindbarsbimbo 10:11, 12 July 2009 (PDT)

Addendum. Resulting Technology, corrections.

Although the logic and results of the testing stated in the article are true, I did make some errors in writing it. After further investigation I made the determination that in fact the 02 sensor on this car is on the right side manifold, 'in front of' the intentional exhaust leak. The exhaust leak 'did not' affect the sensor. As it turns out, that sensor had been 'dead' all along. When sensors are disabled, computer automatically goes to default of 'medium rich'. When I loosened exhaust manifold in front of catalytic converters, it simply allowed the exhaust to improve, as 'converters tested as clogged'. The car ran too rich to begin with because of the dead sensor, not an exhaust leak. This is what ruined the converters, long before I bought the car. Once the exhaust leak was made, at 1oz. acetone per gallon gas, the engine seemed to sound like it was running a little lean. It was sputtering a bit at an idle. I made an adjustment, which I later learned was that I had increased 'injection pressure' by adjusting injection pressure regulator. It then began to run smooth again. So in doing that, I increased gas flow 'even more', perhaps too much in fact.

The resulting lessons and technology learned from what is now 2 years of research is as follows: Both acetone [in pure gas] and ice in front of air intake [any fuel] creates 'increased air intake'. To take advantage of this to gain HP and MPG one must increse fuel flow. This can be done in a number of ways, including disabling 02 sensors [idiot light may come on however], and by installing an 'adjustable' fuel injection pressure regulator. Most cars are not adjustable from factory. Both the use of acetone and ice will 'only increase MPG at higher RPM range', because in city driving 'low RPMs does not create enough air flow' to compensate for increased fuel flow. Thus, at low RPMs the vehicle will run too rich. Running too rich eventually destroys converters. The simple solution to this problem is to put a fan in front of intake, to force air induction at all RPMs. A multiple speed fan would be preferable. With forced air induction, one will see improved MPG without damage to converters, 'with or without' acetone. Ideally, one should aquire access to a shop with gas analysis equipment/emissions testing equipment. Then one can make sure hydrocarbons stay low enough after modifications, so as not to harm converters. If hydrocarbons are too high, one must increase air flow or decrease gas flow. The hydrocarbons ppm stated in the article were the 'low RPM readings' which were too high. At high RPMs hydrocarbons were much lower. Although some people have done this, removing your converters is not a good idea, as there is a $25,000 fine for removing them, if you get caught. I did not remove mine, I only relieved excess back pressure by loosening exahust. On an 85 it is legal to have exhaust leaks. If done properly, one can achieve high MPG without any modifications to exhaust, as I did, because a functional converter does not produce excess back pressure.--Behindbarsbimbo 09:13, 22 February 2010 (PST)

"Mileage Master" video now available.

Steve Gage describes several known techniques of increasing mileage, including the use of acetone. [Mileage Master Video][6] --Behindbarsbimbo 15:05, 12 February 2011 (PST)


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