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I'm contemplating buying a 2500 ram from a friend of mine with 4.10's. I never tow anything so I don't really need the pulling power so I was thinking about swapping in either maybe a 3.31 or a 3.56 to get better mileage. My friend says he gets about 16-18 and I'm hoping to get low 20's. What does everyone think of this and what kind of mileage do you think I could expect to get?