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Originally Posted by Skip Towne
I can feel the engine lug down when I turn on the A/C. And I check my mileage every time and I know that the A/C uses between 1-2 mpg. I feel no such lug when turning on the lights. But, then, the alternator is already turning. So it can't be using very much fuel to run the lights. I'm not sure it uses any.
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Not as much as the A/C, no. But it does decrease mpg efficiency. It has to. Unless, of course, you have headlights that don't run on electricity.