It came with a too small fuel tank and doesn't get the mileage a diesel should. 6-8 pulling a 28ft camp trailer and 16-18 empty depending on what tires I have on it.
Good LORD! My Kenworth gets 7-8 grossing 88,000..... That Cummins should hardly notice a little camp trailer behind it.
They shouldn't but they do. My '08 Dodge Cummins with manual tranny gets 17 empty. With a 5k camp trailer and a stock rack full of llamas in the bed, it drops to about 11. Admittedly, when it's loaded like that, the roads are usually more vertical and lower gears are used quite a bit.
