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...you want to separate aerodynamic drag (proportional to V^2) from viscous drag (proportional to V) from constant drag (fixed amount, not proportional to speed)...
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I can imagine aerodynamic and skin friction drag, but what is constant drag?
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Another thing to watch is the road slope.
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I'm now on board with level, no up or downgrade is going to be constant.
The only locations I'm aware of that might get to 1 in 1000 slope would be the salt flats in Utah and Bolivia.
Wind is another matter -- maybe a fixed course between two weather stations?