THis truck has been a great vehicle. I have the Duramax Diesel / Allison tran, 4x4, CC, LT package. I added a powerchip programmer to it and I get around 18.5mpg, not pulling a trailer, around 13mpg pulling a loaded 18', but the power remains the same either way. You can not go wrong if you need a truck for driving around town or pulling a trailer around.
MPG, interior design, POWER.
Injectors, had mine go out at 90k, but dealership repaired at no charge.