You don't buy a diesel f250 because you think it is a smaller C12.
You don't expect 1.2mm miles and are disappointed at 350k.
You buy it because it's better than what's available in the same chassis but with gas power. It lasts longer than that 351W or 5.4 Triton. You put 300k on it, hard and still have something compared to the gas peers at the same mileage.
Average mpg isn't the only way to calculate ROI when comparing diesel vs gas in sub class 4 trucks.
