If you went the easy way (wrapping the springs with wire and mounting a strong magnet on the shock absorber, from what I understand from this thread), about how much would materials cost to do all 4 wheels?
I would assume you would want some thinly insulated copper wire, to prevent the elements from causing corrosion?
This sounds like the most promising area for energy production, although it depends on road conditions. California has some pretty crappy roads so...
Combine this with a thermoelectric generator on the exhaust/catalytic converter and you'll really have something going.
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