I've been adding acetone to my fuel(2 oz. per 10 gallons) for the past month or so. I'm fixing to quit doing it. I'm seeing no noticable fuel mileage improvement. I knew it was a crock of shit. I guess i'm gullible enough to try anything. It does seem to give your car more pep, but who knows. Anyway, it's not worth the trouble, in my opinion.