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About a thousand different things figure into mileage. Just off the top of my head: Weather, gas formulation, the truck's body-style, driving style, traffic pattern, wheel and tire size and weight, how much junk you carry in the truck. Unless you can say every single variable in your situation is exactly the same as every single variable in the next person's situation, you may not get the same mileage. If you don't have much stop and go with these trucks high teens is very attainable. If you are always stopping and going expect to see 11-13 mpg.
The cost of fuel to operate a 6000 pound 400 horsepower half ton that does 0-60 in under 7 seconds is kind of like the price of oil changes for a Porche 911. If you have to ask you probably can't afford it.