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The ground friction is magnitudes higher in an off road situation. Very little to do with aerodynamics. Not saying that their might be some improvements. To understand it better ride an off road bicycle and a road bicycle. Hills are 5x steeper.
About the best thing going with dirt bikes is that they are single cylinder and usually of small displacement and have good lower rpm torque, all good attributes for fuel economy. A far cry from the two strokes of my youth.
I still have two of my old road racers both 2 stroke twins. Both energy hogs but I love them.
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The supreme power in America cannot enforce unjust laws by the sword; because the whole body of the people are armed.”
– Noah Webster, 1787
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