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On Jeeps website (I can't remember if it was the official one or a forum) they said that if you know your gonna be stopped for over a minute, you should turn off the engine, because you'll be using more fuel than idling it. That was with typical Jeep engines, which are normally atleast 2.5 liters for the 4 bangers in the wranglers. but on average a 3.8L or bigger.
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