Q: so i have an 01 jeep grand cherokee laredo 4x4..and i know all the techniques in driving to get better fuel economy..but i want to know of some modifications i can put on to get around 26mpg HWY and around 20 mpg city...i know about the air intakes/short ram, better muffler..but how much extra mileage do they actually give? by the way i have the 4.0 l6..thanks!
A: buy the book