[Jack Black]

Acetone is a strong organic solvent and may dissolve small non-metalic parts like o-rings and gaskets. It's also more expensive than gas, so it won't give you any cost savings.

If you want to clean your engine from the inside use a commerical product for cleaning fuel injectors, available at auto parts store, like STP, or Gunk. Most people I know don't use these types of things routinely. If your car has sat for a long time they can be useful.

[dblshot]

Man I can remember way back pouring Marvel Mystery Oil down the carbs to clean up the top end. Wouldn’t use acetone though. It will melt asphalt. I know because I wrecked a motorcycle and slid on asphalt and had a coast guard corpman clean by back with ‘alcohol’- only he got the wrong bottle and it was acetone.

[RegulatorCountry]

Gasoline has acetone in it, along with toluene and any number of other strong organic solvents. Adding 3 oz. acetone to even a small, 13 gallon tank of gas isn't going to dissolve anything that gasoline itself would dissolve.

These fuel additives, injector cleaners, etcetera contain, guess what, acetone and toluene.

Anyone making exaggerated claims of really big improvements is fooling themselves, but it does improve mileage somewhat.