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by Anonymous on November 9th, 2005

Anonymous

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Does using the defroster in a car lower your gas mileage?

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  • by A A on November 10th, 2005

    A A

    Yes. Using anything like the A/C, Heater or the Defroster will use more gas because that causes the engine to work harder.

    Do a self test. Fill up your tank and run the A/C or Heater all the time until you reach the halfway mark on your tank. Check the miles.

    Fill up your tank again and run your car without the A/C or Heater - (Defroster) running at all. Mark your miles half way through that tank of gas. You will get more miles per gallon on the second run.

    In response to BooBooToe... It's true the heat is free but the blower motor is still pushing that hot air into the car and is using gas, therefore I stand by my answer.

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    • Not completely true for heaters .Almost all heaters use waste heat off the engine which is free energy

      BooBooToe

      by BooBooToe on December 1st, 2005

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