Earlier today, I read on the internet that you can use acetone as a fuel additive and get better gas mileage from your car. Now, since everything on the internet is true or, at least, I don't really care if I accidentally break my truck in the name of science, I dumped about 3oz. of acetone into my mostly full tank of gas. I'll let you know how things turn out after a tank or three for statistics. According to http://smartgas.net, who seem to have looked into it a bunch, adding 1-3oz. Of acetone to 10 gallons of gas will give you up to 30% better mileage. I'll keep you posted.