I have a Dodge 3500 with the Cummins and the 4.50 rear end. I am in the 18-19 range all the time. At highway speed the engine turns a little high with the low rear end. I actually do better around town.
I have talked with a number of people with the same rig plus 4x4 and the higher rear end they were in the 22-24 range highway.
You used more oil at changes but with the large capacity the cycle is a little longer. The oil filter is 14$ and the gas filter is 50$. The drive train has a 100K waranty. Cummins engineers state there is nothing for the engines to do 500K . I have talked with a number with these type of miles and no repairs.

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