what uses more gas a car ideling or starting?

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  • 1 decade ago
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    idling. That is how hybrids save gasoline- they shut the engine off when you stop. Then when you accelerate they do it with an electric motor until you reach a certain speed.

    Idling at a traffic light can cut your mileage one tenth of a mile per gallon , you lose 1 mile per gallon every 10 traffic lights you stop at.

  • 1 decade ago

    idling.

    you don't use as much gas as you think when starting. starting an engine uses as much gas as approximately 8 seconds of idling. of course engines will vary slightly, but they should all be in the same range. so basically if your gonnna idle for longer than 8 seconds, its better to turn off your engine. common sense, why idle? why keep your engine on if your not moving your car?

  • 1 decade ago

    idling if running more than about 5-10 seconds.

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