If you want to minimize the effects of headwinds and tailwinds on your car, install an airspeed indicator so that you can compare your airspeed to your ground speed. This lets you determine when you are in a head/tail wind situation, so you can drop your ground speed to compensate for the added drag of a headwind or increase your ground speed, if desired, to take advantage of a tailwind. Also, if you are in a drafting situation, it lets you know the best position for optimum drafting effect. Airspeed indicators sold for ultralight aircraft cover the usual highway speeds.
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