My 2009 Dodge 2500 4x4 (410 gear) Cummins 6.7l turbodiesel is a hoss! Fuel mileage as a daily driver would suck at about 14mpg, but 10mpg dragging my 2015 Gateway and my fat butt ain't half bad. Factory engine specs say good to 350,000 then rebuild. It's a truck. Some of the others are just...