I did a rather unscientific test several months ago after reading acetone may help mileage. I have a cardlock fueling service on my company vehicle. I know the exact mileage since the truck was put into service(3 years ago). For 2 months I added 2 gallons of acetone every fillup(about 10%). At the conclusion of the 2 month period I compared the before acetone data to the during acetone data and found that if I added the volume of acetone I mixed with the gasoline(say 20 gallons gas plus 2 gallons acetone=22 gallons fuel) I lost over 3/4 miles per gallon. Maybe unscientific but my money's on "IT DON'T HELP MILEAGE". Another myth busted! -Bob