I know some guys with big 3 diesels with 350-500k on there trucks. All newer 02-07 some have had a number of repairs some have had 0 repairs. The Duramax and Cummins seem to be the more reliable, the Cummins more so but it's still in a dodge. I get around 19-21 on the highway @ 70 MPH AND 15-16.5 City and 11-15 towing, depends on weight. I only have 45k on my 07 LBZ Dmax so time will tell for me. I am always amazed when I hear a diesel owner complain about mileage on a 7k lb truck with 300-365 hp and 650 ft/lbs of torque. However I have noticed most of these guys never pull anything either. If you think a Dmax is bad on fuel drive one with the 6.0 gas.
