Well, I finally bit the bullet and bought a new truck. Its a 2007 Chevy 2500HD 6.0L, extended cab, 4x4, LT package. This truck absolutely blows my mind and far exceeds my expectations. I drove about 100 miles to get it at a dealership. Before I left on the trip back home, I filled the truck with gas, when I got home I filled it up again. With a fairly light foot and cruising at 70mph (90% highway), I was able to achieve 17.38 mpg!!!! These are hand calculated numbers too. I absolutely love this truck!!!!!!!!