between Chevy 5.3, Ford 5.0, and ecoboost, I can tell you this. First off don't get the chevy 5.3 (2008), I didn't like the way it pulled at all. It would struggle pulling into a headwind with a 16' express, truck seemed like it forgot where its gears were... enough said to that
Between the 5.0 and Eco, I think its a preference thing. For our bay boat, the mileage is similar (5.0 may be a tad better, I never drove it and my uncle drives much slower than I do so hard to say about mileage) I do know that when I set my(ECO) cruise at 70-73 with our bay boat, it'll never drop a gear going from Opelousas to V. Bay and mileage is anywhere between 11-13mpg with our bay boat, just depends on wind/load and whatever. With my 16' express hooked up, I can drive 75 and mileage is usually right around 15mpg. Mileage on interstate at 74mph is usually 17-19mpg, you drop that to 68mph and its over 20.
EDIT: Forgot to mention these were all 4x4 trucks. In the fords are 3.5.5 ratios
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