i've heard alot that acetone is bad for your vavles..but i've seen alot of people run it to up the octane rating so it's like mild racing gas..i just fill my car up with 93 octane then put a gallon of denatured alcohol in it and it boost the whole tank to a 106 octane rating..plus you can feelthe little bit of get up and go it gives it....tha bd thing i heard about acetone is that it eats shit up liike your tank and other shit... plus denatured alcohol won't eat shit up and it cleans out your entire fuel system....