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Fuel mileage difference with the factory gears?
fellas, I don't really need needa big superduty, but I'm looking hard at a few 6.7 3/4 tons and a few 1 tons. SRW only, crew only, 4x4 only etc. one of the few option differences I see is one has a 3.31 and the other has a 3.55 rear gear. I do a lot of highway driving with no load at all, how much better would the fuel economy be on the highway with the 3.31 rear? also, I don't tow anything more then an enclosed bumper pull car trailer (will never weigh more then 9k lbs) if I tow a gooseneck it won't be a severely heavy load and won't be often at all.
I currently have a 6.0 gasser 1/2 ton chevy, it pulls good but has a 4 speed transmission and 3.73 gears and I only get about 14 mpg doing 75ish all oklahoma/texas driving. I love my silverado as it has been bullet proof, but the mileage, and only having an extended cab is kind of putting me off after some time. and I figure when I tow my trailer behind it I only get 7-8. obviously there is money to be saved there. I'm thinking a short box should be fine for what I'm doing as well. at most it might have my brute force in the bed.