Helping you get better gas mileage, save money on fuel, find more efficient cars, and be kinder to the environment.


Updated Automatically on November 21st, 2008
better gas mileage

Like the “Turn it off or leave it running” question, this is one that’s been asked a lot of times and one for which the answer has changed over the years.

Years ago you would get better gas mileage by turning off your air conditioner and rolling down your car windows. That is no longer the case.

Since the late 1980s cars have become more aerodynamic and air conditioners have become more efficient. Rolling down the windows on a modern car can significantly harm the aerodynamics of the car and reduce your gas mileage. With a modern car, using the air conditioner will give you better gas mileage.

Of course you’ll get even better gas mileage is you can drive comfortably without either using the A/C or rolling down the windows.

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Updated Automatically on November 21st, 2008
better gas mileage

One Response to “Which Gives Better Gas Mileage: A/C Or Windows?”

    Recent tests by indicate that, contrary to the popular myth, automobiles give better gas mileage at 65 mph with the a/c off and windows down. The average improvement on the two cars in the test was about 3 percent. That’s not huge, but it is significant.

    In tests shown on the TV show mythbusters, in a test of two identical cars traveling on a test track with only 5 gallons of gas in the tank, the car with the windows down and the a/c off went 30 more laps than the car with the windows up and the a/c on.

    I don’t think there is any stopping the myth that driving with the a/c on and the windows up will give higher gas mileage.

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