The goal 25mpg mixed driving, some easy trails, beach trips. Starting point a 91 k5, 350tbi, power everything, auto trans.,np241, stock running gear 31x10.5 bfg's. Speed is not a huge concern but it must be able to keep up with traffic. Diesel, gas both are fine. Perfer to keep the auto trans. I know there will be a few people who suggest getting a Geo, honda or somthing but the K5 is what we have to work with. I feel confident with enough brains working on this it CAN happen. Lets begin!