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They reduce drag a bit depending on your windshield angle but they can reduce wind noise a lot. You probably can't measure the difference in drag with mpg's but the wind noise reduction can be nice. If you are driving on those lovely interstates paved with fist size rocks you won't notice either.
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Vortex generators are old tech. My new and improved vortex alternators are unstoppable.
"It’s easy to explain how rockets work but explaining the aerodynamics of a wing takes a rocket scientist.
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