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I had an idea for a muffler that was pan shaped that sat in the exhaust of the car and used the engine's pulsing exhaust to vibrate the mechanism and produce electricity, it would also muffle the engine. I never ran any numbers to see what could be obtained. I think I might thanks for the reminder!
But to answer the question on road noise energy? I don't believe the pressure gradient would be great enough to harness much of it. IMO not enough power to be harvested.
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