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I was watching a mythbusters yesterday on hypermiling and they found with the all the devices they used for measuring gas mileage that sitting at a light used 0.5 gallons per hour if you figure that your car idles for about 30 minutes on a tank of gas you've used at least half a gallon of fuel to that do pretty much nothing. Considering modern fuel injected cars use the same amount of gas to start up as they do in 7 seconds of idling all you need to do is be stopped for at least 8 seconds to save gas
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