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COASTING & A/C vs WINDOWS

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  • COASTING & A/C vs WINDOWS

    July 2010 Popular Mechanics, "The Truth About Energy" issue. Page 78.

    Myth: Coasting to a stop saves gas.

    Truth: A car actually consumes more fuel coasting in neutral than it does in gear. That's because absent any throttle input, an engaged engine reduces the flow of fuel to the injectors.

    My Guess: Shifting to neutral while stopped takes a load off the system and saves fuel.



    Myth: Driving with the A/C off and windows saves fuel.

    Truth: It takes 2 to 8 hp to run the A/C, so when driving at city speeds, turning it off does save energy. But on a highway, open windows can significantly increase drag.

    My Guess: I usually open the driver window and crack the passenger window a few inches at speeds below 45 MPH because it's less stuffy and the wind noise is acceptable.
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