[Mean Green]

Originally Posted by dolemite

I use the synth because I like giving my car extra love, but a better lubricated engine sure won't get worse mileage. Tires, driving habits, rpm's - those seem to make the most difference. There's some speculation about cold air intake, throttle body spacers, etc.'s effect on mileage.. haven't tried those yet.

No help for mpg there. Here is a good read for supposedly gas savers.

Looking For A Miracle: We Test Automotive 'Fuel Savers' - Popular Mechanics