I have a 2001 F250 SD with the 5.4. Mines 2 wheel drive and Im probably seeing 12-14 mpg. It has plenty of power for sure. I don't think you will be disappointed. Good luck with your decision either way. Like JoeF said, they are notorious for coils going. One of mine dropped when I was fully loaded with about 15 miles left to the yard. She stumbled some, but made it none the less. Replaced the coil pack and plugs that day and so far, so good, knock on wood.
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