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Waste? No. Use more fuel? Yes. If you have, say, 200W (worth) of lights in use, then that energy must come from the fuel tank. The fuel powers the alternator, charges the battery and lights the lights. Assuming 60% efficiency, then you'll need an extra ~300W-worth of fuel to keep your car going.
It equates to about 0.4hp or slightly more than 0.5% 'wasted' fuel in a 150hp car.
Or something.
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