Check this out:
http://www.lubedev.com/smartgas/additive.htm
http://www.peswiki.com/energy/Directory:Acetone_as_a_Fuel_Additive
I just started adding acetone to the gas in my 95 Isuzu Rodeo, 96 Ford Contour, and 93 F-150. I'll let you know how I make out with it. Here's where I first heard of it:
http://www.ford-trucks.com/forums/showthread.php?t=407402
:repost:
http://www.foxtbirdcougarforums.com/showthread.php?t=2702&highlight=acetone