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When driving in windy conditions, I'll adjust my speed for the airspeed, not the ground speed, since the airspeed is what the aerodynamics of your car is seeing. I've thought at times about installing an airspeed indicator from an ultralight in my car to make it easier to make these speed adjustments. If you are into drafting (I'm not, since drafting has little effect on my car's mileage at normal highway speeds), an airspeed indicator would also tell you where the best position for drafting is.
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