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As compared to what? Up hill both ways I presume? There are no free lunches in thermodynamics. It is a energy equation involving rolling resistance, mass, and air resistance. A diesel might do better but the engine and the fuel cost more. Some of the new 5th wheels have nice rounded noses, completely paneled in under bodies, but still need boat tails to make them work properly. My guess is a V-8 would do as poorly and it weighs more and has more internal friction. We shall see and when I get one I will report on it.
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