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I have a very heavy 1990 crew cab 4x4 f350 c6 with a 351W with 4.10 gear ratio, i still get 10-11mpg. mileage will vary on these trucks depending of the rear end gear ratio. usually 10-17 mpg on ford trucks depending on vehicle weight, transmission engine, gear ratio.
Thanks for the info. I have a 94 f350 with the 351 and i get 8 towing and 13 empty. was thinking i would trade it if the i6 got better mileage. think I will just keep my truck.