Just got 35 mpg from my last tank. I increased my acetone input to 4 oz for the latest fill up, and am running 1 oz each of the GP7/toulene/xylene/mpz.
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unstable bob gable
AMERICAN ROAD WARRIOR!
I just started reading this thread and I have a 1990 buick reatta with the 3.8 engine and can get close to 30mpg without acetone. On a trip to Nashville one time I computed the mileage without the long traffic jam (it has a built in code reader) and came up with close to 35mpg. Personally I think that most of the mileage gains/losses are from tuning and some are from driving habits.