i got better perfomance out of xylene. That and toluene wasn't as readily available. Toulene didn't seem to react as well as xylene, but i think chemically, they are very similiar. Check out turbobuick.com, i know there is some stuff on both somewhere on that site. I ran 20lbs of boost easy on the street with 92 octane(amoco) gas and xylene mixed 3:1. I am talking about a turbo buick. It is my understanding that any more of a mixture won't work. I could be wrong. keep researching, you will find the answers.