Some years ago, I was told that Acetone was a good additive to increase fuel mileage. Followed what was advised on the web as to dosage. Mileage did get better, for a couple or three tanks it got Progressively better, then leveled off.
Decided to not mess with it anymore, so quit using/adding the acetone. Mileage stayed the same for about 5-6k miles. 2oz per 10 gallons, mileage came back up. Heck of a carb cleaner! Finally got some sense and read the ingredient list on Injector cleaner, Oh yea, it's acetone.
Finger nail polish remover is the expensive way to buy it in an emergency. It'll say 100% acetone or maybe 97%, with unknown/misc 3%. Or by the gallon at the paint/hardware. It's a bit more of a pain to repackage and put in tank.
Do it a tank or two prior to oil change. Just in case your piston rings are leaky! It's a viscosity killer in your oil. Injectors, carbs, fuel delivery system. Good stuff. Gasoline only!
