well here is my experiance. I have been driving a lot latley, and i noticed that my gas mileage was not doing so well. i was getting about 15mpg and i was driving 40% highway, 60% city. last week i decided that i was shooting for maximum mpg, on acceleration i kept it under 2000 rpm, and i cruised at 65 on the highway (2000 rpm) and just by doing that i got 20 mpg and majority of that was city driving. my mods are listed below. I am a firm beliver that my lead foot was the reason for shitty gas mileage. try it , it really works.