"I have a 2000 Chevy C/K 3500 Used with a 5.7 liter Gas, Crew Cab total mileage is 92000. It took me a year to find this car used with such low mileage. They are hard to find because they are still in service and rock'n and rollin on the streets,freeway,and back roads of America.. Even though the Vehicle does not have the 454, the 350 does more than I asked.. I don't haul alot just a boat and trailer and it does just fine. "GAS MILEAGE" The big "CON" Lets be honest These trucks are not exactly designed for the best intreset of the conservationist. These trucks are designed to serve one purpose and one purpose only.."