Never heard of the stuff before this thread and thought you have to pay $8-$10 a gallon for race gas. 40 cents a gallon to raise 93 octane to 102 octane effect sounds too good to be true. But what is that "effect" in their description supposed to mean? I bought a car (not Audi) that had a turbo kit installed and the previous owner damaged one piston because of detonation, so after putting it back together, I'm leary of getting on it using pump gas. Sounds like an ideal solution if it works as claimed.