You won't adjust your driving style based on air density, but I do adjust based on airspeed. Rather than running constant road speed, I run roughly constant road load, speeding up slightly when airspeed drops, and slowing down for a headwind.
I do this without a gauge. But if you want to throw a simple pitot tube in your car, why not? It would be cool if the readout were in the same units as your speedometer, but even if you left it in KPa, you'd be able to see winds.
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