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I remember reading somewhere that LED's draw roughly 90% less than incandescent bulbs of similar output. And overall, if you're going to swap for LED's, you should start with the bulbs that remain on the most, IE park/licence plate lights.
I also remember reading that the average dual filiment bulb is rated for 30 watts for bright (2.6 amps) and 10 watts (.9 amps) for dim (park) circut. I don't have anything in particular to cite this information, but I'm reasonably sure that it's very accurate.
My Jeep for example had 9 external constantly running lights (parking), so that would be roughly 90 watts being consumed. I've converted all of those to LED, so now it's basically a 9 watt draw, netting 81 watts of savings. I just don't know how much that equates to gasoline use.
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