To add a wind turbine to increase mileage IS building a perpetual motion machine - it's impossible. You COULD increase milage if you drove straight against a strong wind, but if you assume a net zero wind direction (you must), it's impossible for a wind generator to increase your mileage. If the wind turbine was 100% efficent and had no friction (I.E. the very best it could do), the result would be a net 0 increase to your mileage.
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