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I got as far as the first post. There's no reason for any fullsize truck to ever average less than 20 MPG when not hauling anything, even on straight gasoline. I have done 26 more than once. On diesel I've seen 34.8x for myself. Getting 40 MPG without diesel is a pipe dream unless you start with a smaller pickup then upgrade that to tow whatever, which is my own strategy. Finding a fuel at $0.80 per gallon? I can't speak to that.
IDK your idea of adequate power, but I can give you a proven recipe for 35 MPG with 200 HP, or 26 MPG with 400 HP. Either way, you have to do a Chevy rather than your Ford.
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