well i tried the assatone. heres the story so far. my exhaust smells much better when idleing. can't get my nose back there while driving tho.? i run as lean as i can. i dont have any black smoke that i can see when revving the engine in the driveway or on a full throttle run. but with the acetone in da gas i get black smoke when revving the engine. so it must effect the octane or slow down the burn. no assatone no dark smoke. cant say i got more power from it. engine starts just the same as before. gotta keep em fine tuned with lots of tlc. that is what makes em run. snake oil cures just dont seem to do anything. at least i don't stink as much when i'm idle--ing. anyone else have some concrete info about the acetone?(this has been my longest thread) everybody keeps coming back for more. acetone is strange stuff.