Some fuel manufacturers (mainly car fuels) proclaim that they put in this special additive (I'm referring to ZX-7 for Blue Thunder Sport Formula). It's supposed to prevent the car engine from over-leaning. I think it's just mumbo-jumbo, because all the additive does is change engine noise and bog the engine down. It's hard (I'm assuming) to hear the noise of your engine in a car race and to be able to distinguish it from others. Also, if you're a newbie how do you tell when the engine is bogging down??? One selling point of the fuel is that it is easy for beginners to use... [sm=confused.gif]