Diffrent idea. Same reason. I have been told that small amounts of acitone added to petrol makes it vaporize better (2 mill to 1o gallons maybe). This in turn can couse beter burning, and then better performance / MPG (depending on driving style). Any one know anything about this? Assasin? No idea if there is ANY substance to this idea. That's why I'm putting it on here. Maybe one of you does know if this works... or not.