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Ive been thinking about this as well and while I like the idea of saving fuel, I wonder how much fuel Im really saving with engine off at lights (of course every little bit helps and over time it will add up). My drives are probably far less hampered when it comes to time spent sitting, and I would be suprised if I would be able to actually save even 1/2 gallon of fuel over a complete tank, but others mileage will of course vary. I think the main improvement of engine off use is when coasting up to a red light from a distance and then continuing to sit with the engine off until its time to restart. Thats where you get the biggest gains assuming the car can be safely EOC'd.
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