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Lights on a car do not cause any major fuel cost, as they are run off the battery. The engine has an alternator on it that is working all the time charging the system up. This is where the lights would cause any fuel costs. The alternator may put extra load on the engine, but it would be hard to notice any difference in fuel costs.

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โˆ™ 2011-02-26 14:28:11
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Q: How much more fuel does an engine use when the car lights are on?
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