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What about a scale model wind generator? Maybe a working one, big enough to power a single CFL bulb. Then you could put a scale model of your car beside it. You're showing the concept to the passer-by, but not misleading on the size required.
Mini windmill (working), powering a light, with a model car plugged into it.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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