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The pictures in the first posting don't show what the speed factor is. I don't think that the speeds we travel is anything close to what is needed for true cavitation, but a shape that would create some kind of vortex generation is more feasible, using the same principle.
How about this. Instead of thinking about a whole vehicle generator, start small and create a probe that would stick out in front of your mirror to generate a vortex to lessen the drag on the mirror. This would be easier to tuft test, and wouldn't get as much potentially undesirable attention as a clown nose on a pole in front of your car. And the smaller size would allow you to experiment more with the effects of different shapes shapes and sizes.
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