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I tow my little 8x12 enclosed race trailer with my 06 F150 5.4. Gas mileage drops from 17ish down to 9ish, and the poor truck really struggles with small hills and headwinds. I think I have a 4 speed. A buddy tells me the newer trucks have a 6 speed, and it makes a huge difference in towing. I've also heard Ford is coming out with a 8 speed. I was waiting for a 1/2 ton diesel from Ford, but this could change my mind into staying with a gasser, if true.