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From the shape of that curve, a mathematician can sort out the wind resistance and rolling resistance figures at any speed. However, slower always takes less power - the best economy comes at the point where the motor is so under-used that it's excess capacity eats up more than the savings. Also, it is not necessary to start a coast-down test from top speed, although it can improve the data and the fun factor.
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There is no excuse for a land vehicle to weigh more than its average payload.
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