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Thanks Vwbeamer, so it looks like your 120 watt load drops your mileage by .01 gallons per hour, last I figured it out my average speed over the last 30,000 miles was around 35mph so 857 hours and a .01 gallon per hour increase in fuel used 8.5 gallons of gas over the last 30,000 miles, so if I put LEDs just in my running lights and kept using them in every car that I own from now on they would pay for them selves many times over.
same thing if I chose not to have a big amp on my radio, or to keep my vent fan on high all the time (over 70 watt draw if I remember) and of course your battery will last longer, alternator, everything, but the point of this thread was to find out how an electrical load affects your gas mileage.
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