ANSWERS: 3
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Depends on what kind of car you have.
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none if you have one of those new hybrid ones that turns the engine off when stopped... i have heard it kills your starter and wastes more gas if you turn a regular car off and start it again though... if you wanted to measure exactly then take your idle rpms times the time times the ammount of gas used per rpm
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If you have a pre-hybrid engine, then it probably uses about 1/4 as much gas while idling as it does when cruising.
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