Correct answer
Wind blowing from behind.
A tailwind slower than the vehicle reduces relative air speed compared with still air. This usually lowers aerodynamic resistance and the energy needed to maintain the same road speed. It does not mean it always pushes the vehicle or guarantee fixed savings: the engine, road, load and other conditions also matter. Do not increase speed to exploit it.
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Wind blowing from behind.
Wind blowing from the front.
None: relative air speed never has an effect.
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