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My point was not to get people to drive around in the dark with their lights off, my point was to acquire a piece of information, if I want to get a stareo in my car with a big amp that is going to draw 200 watts, how much is that going to increase my fuel usage? head lights are a pretty standard number of watts 55 to 65 watts each, so if you sit in your fully warmed up car with the scangauge set to gallons used per hour, then flick the head lights on and you watch how much the number goes up, THEN you will find out how much of an electrical load it puts on the engine, and how much having a 500 watt dash board electric defroster might affect your mileage (altho that number on it's own would be nice as well) or how much savings switching to LED bulbs all around might get you, but if you don't have the information then you are just making stab in the dark.
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