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Your math seems sound to me as well. I say it's pretty clear: you burn a gallon of gas a week idling. Install a kill switch and pick up that slack! You'll save $150/yr.
Besides, it's very relaxing to turn off your engine and roll up to a red light with no noise other than that of your tires. It also removes the pressure to get away from the light in a hurry, since you're burning zero fuel sitting there.
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