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...a couple things to remember about trying to use a weather anemometer on a car:
1) There's a difference between "cups" and "propellor" wind-speed devices; one's better for lower speeds, other for higher speeds, but neither are 100% accurate.
2) How's your polar-algebra, because, there's a vector diference between car direction and wind direction almost ALL the time...sometimes positive, sometimes neutral, sometimes negative.
3) Wind flow over the car body WILL channel/deflect the actual AIR wind directions & speeds.
4) Lastly, the REAR of the vehicle is where MOST aero drag occurs, so are you prepared to put a second anemomter back there too?
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