Follow the 10-second rule.
Whether you’re picking up a slowpoke or waiting at the drive-through, turn off the engine if your wait is longer than 10 seconds. Idling drains your tank by a quarter- to a half-gallon of fuel per hour, whereas restarting only sips 10 seconds worth of gas, according to the U.S. Department of Energy. Even in winter, there’s no need to sit in your driveway “warming up” the engine. Most manufacturers recommend driving off gently after half a minute.
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