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I always understood it that rear wheel horsepower is measured at the wheels instead of the crankshaft... that's all. That being the case then gearing, parasitic drag of all the drivetrain components, and even tire size/weight are all a factor. If you changed the gears, tire size, tranny, whatever you'll get different results because it is a true end result at the wheels.
Saying how much horsepower an engine has is a result from measuring it at the crank. Saying how much horsepower your Jeep has is a result of measuring it at the wheels.
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