If getting 4 or even 5 mpg from a tune was really just that simple, don't you think more people would be doing it??


Driving style/habits play the biggest roll in mpg if the engine is totally up to snuff. I played around with timing many times when I owned my grand prix, made MAF adjustments, made corrections for mods done and even with all that and a steady foot on the freeway getting 30-31 mpg was about all it could do.