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What engine/drivetrain/rearend combo do you have? To some extent, you are correct regarding the relationship between torque and HP. Remember though, its torque that actually moves you. Its the gear multiplication through the transmission and rear end that allow freeway speeds. Different engines respond differently to different loads and so on.
I tow a 25' airstream with a 1/2ton suburban with a 350 and 3.73 rear end. I usually get 12-13mpg regardless of speed. I ususally don't tow in OD unless its REALLY flat ground. Its much harder on the engine to lug it rather than rev it.
Tripp
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