I have a 92 4wd 3.0 ext cab with 57000 mil. First is the gas mileage problem. I get anywhere from 12-13 mpg. Now i'm not sure how quick these things take off or what there top speed is but i get about 90 mph top end and about 13s for 0-60. I think that may be average. I had a leaky fuel enjector that was replaced. other than that, i haven't replaced anything. i bought the truck with 52000 mil. any suggestions?