Automotive Fuel Hack





Introduction: Automotive Fuel Hack

About: Overworked ex-surf rat (injuries...) that digs mods and hacks

Improve mileage 2-3 MPG, both diesel and gas, smoother running and quicker accelleration. This was not my idea, however I felt this was the forum to share it with.

Step 1:

Purchase 100% pure Acetone and add to full tank of gas or diesel at the ratio of 2oz. per 10gal. of fuel. Do not use cheap plastic container as a refill container as it will melt. I bought a Cutex nail polish remover bottle (4oz), ran the contents through and reused the container.

Step 2:

Results 1997 Ranger 172K 3.0L V6 @ 3.75 oz per fill up= Went from a measley 17mpg to 19.34mpg! Additionally the truck has smoother accelleration and spark knocking has all but vanished completely. As I understand it, the acetone acts as an agent to help disperse the gasoline in the combustion chamber increasing amount of fuel actually burned vs. sending unspent fuel into the atmosphere. Any simple search terms including "acetone as a fuel additive" will yield many hits, some with much comparo data broken down by manufacturer.
*added benefit to diesel guys: reduction in smoke!



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    Quick question - how does this effect the life of the CAT if at all??

    The biggest help that I have ever seen is to use a high flow air filter such as te K&N; or similar. We went from 17 mpg to 26 in my wife's 1992 5th Ave. (I also removed all of the restrictive air-box and piping) I will try this suggestion to see if I can hit 30 mpg.

    1 reply

    You can use no air filter for testing purposes when its rainning...

    Anyone care to donate a car to science? Just try it for a month and then look at what the damage is. I'm a bit disappointed with the car talk guys, they didn't think to say that the acetone should never be poured in straight, but should always be pre-mixed. Doesn't matter if it works or not, they should advise pre-mixing for the curious. Maybe they were too caught up in the corporate mind-set after that talk they had with the oil engineer. The evaporation problem should be addressed as a potential error factor. If the acetone is evaporating back out of your gas tank before any meaningful mileage is racked-up, then you can't say what effect it would have on your mileage. I have used acetone, and I know it's gone fast! It would be neat if someone were to come up with an automatic mixer. That is, to add the acetone on demand shortly before the intake valves. That way, a proper estimate can be made. Cool points if it's plc controlled and in-line just before a fuel-rail! It might be better to test this out on a constant load engine, such as a generator. That would allow spraying the acetone on demand, like in a nitrous set-up. I think a real expert would be one of the fuel wizards out there on the drag-strip. Those guys who make it a regular practice to shave tenths of a second by mixing their own gas ought to know if acetone is worth any further research.

    1 reply

    Only works on cold weather OR pressurized gas tanks... take your pick!

    This trick does work, it can save on fuel, but at the cost of hardware. I tried this in my suv and it seemed to work, instead of around 8mpg city, I got a bit more, and highway from around 15 to 20mpg. The problem was that after about 6 months of doing this, one morning I went out to start my car and it just cranked and cranked but did not fire. popped the hood, pulled the aircleaner and sure enough the TBI unit was dry as a bone. It could have been that the suv was about 13 years old at the time, but sure enough the fuel pump was dead. I didn't use this trick again and my suv is still running today. But after a $200.00 new fuel pump.

    2 replies

    Yes plastic parts in fuel pumps go the way of the DoDo with industrial solvents... maybe there are all metal OR solvent ready ones!? IDONOW

    the service ppl ripped you off with the pump while mine replaces a lot of stuff including fuel pump for $170

    two super easy 'hacks' to increase fuel efficiency. Pump your tires to 1-2 psi over the suggested pressure (usually found on the drivers sill/door) and change your airfilter every 30K, or take it out a vac it clean if you're super cheeep.

    1 reply

    Increasing your tire pressure (within reason) will reduce the rolling resistence - thus improving your fuel efficiency. However, it does that by reducing the amount of tread that comes in contact with the road - the tire "bulges" more in the centre od its width - and increases the wear on the centre of te tread.

    This means that the centre of the tread wears more quickly and you will need to replace tires more often - it's a trade-off - fuel or tires.

    One thing I haven't seen mentioned here: If a driver tries a new trick, with the hopes of it working well, he or she may (probably will) be a bit lighter on the ol' go-pedal, creating a self-fulfilling prophecy effect. The driver probably won't even realize he's doing it. A more scientific way of doing it is to have different drivers in identical cars, swapping vehicles several times. The drivers would have no idea which car has been treated (both will at different times, due to slight differences between vehicles, even from the same assembly line), and which is the control. A simple "I read about it, tried it, and it worked" sounds nice, but it's hardly conclusive.

    4 replies

    Years ago we had a water injection rig that mixed the fuel with small amounts of water, I didnt understand the properties of the mixture at the time but it extend the aircraft flight hours per tank of fuel which was a life saver for us. I have been following what I call a "fuel hack" off and on for the last 30 years or so. It looks like someone has figured it out eeefuel . com We here in the states are the last to know of course, the Asians and the people in Northern Europe have been using this technology for 10 years or more.

    i m reading your comment on instructables. can you please elaborate your concept please?

    There is a thing called Aquamist used on some Volvo's I guess. Mainly to prevent Predetonation in turbocharged cars, its been used for quite a while (intercooler replacement / supplement).

    Also, if you want to see something even more interesting using water check out the 6-stroke diesel Absolutely brilliant.

    Injecting water into the combustion chambers wasn't meant to save gas but to reduce NOx and not only Volvo used this system. 

    Correct! It does work! My 1995 Dodge Caravan went from 18 mpg, to 22. Now that I "hyper mileage", I've added even more. Google hyper mileage. It's simply a driving technique that works.

    What the f... Hahaha Great nickname!


    Unless the chemical you choose to use as a substitute is non-reactive with plastic, you will destroy your fuel lines. I support your idea to find a substitute to fossil fuel but must make it clear that acetone will damage fuel delivery components. My suggestion is to check your vin number to see if your vehicle is flex fuel compatible and run E85.

    1 reply

    I use acetone and was worried about it eating away at my fuel lines too,
     after a little research I found that thats why they only use 2 to 3 ounces to a gallon of gas or diesel fuel,
     if you only use a small amount of acetone you shouldn't have to worry about it eating away on your fuel lines
     this, like any other Instructable is for you to do at your own risk, so if you don't like the idea, or think it's dangerous DON'T DO IT, it's as simple as that