After running the Titan XD for a few months now I feel this is one of the most expensive trucks to operate that I've owned. Mileage isn't anywhere as good as the old 5.9 litre cummins engines. DEF isn't cheap. Most importantly is the maintenance schedule prescribed by Nissan/Cummins. The second service requires dual fuel filter changes along with an oil change. At the dealership the filter change costs are $550 plus $185 (Canadian) for engine oil change. In no way is this competitive with other manufacturers. I'll go with a more capable machine such as a dodge 3/4 ton with lower maintenance costs next time or back to a tundra.