I have a 6.7, had a 6.4 before that and a 7.3 before that. The only one that gave any decent mileage was the 7.3. Any diesel built after the 2007 model year is equipped with a DPF which pretty much renders if incapable of getting good mileage. (to y'all who are gonna tell me about delete and tune I know all about it)
I suspect most of the numbers above are from the computer readout and I doubt they are pin point accurate. So here is my suggestion to help you enjoy your new 65,000 dollar truck.
Get an auxiliary fuel tank so you don't have to refuel twice daily
When refueling, once the nozzle is in the tank access never never look at the numbers on the pump.
When finished filling both tanks tear off the receipt and never never look at it, just hand it to the book keeper and get in and drive.
Enjoy your truck. Oh yeah, get the 4 wheel drive. It's like insurance, when you need it you really really need it and would pay what it costs in a new York minute.
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JUST ANOTHER DEPLORABLE
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