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MPG vs AC & fan speed

Discussion in 'BBS Hangout' started by professorjay, Mar 20, 2009.

  1. professorjay

    professorjay Member

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    How does AC temperature (hi/low) and how fast the fans blow in your car affect MPG?

    Will a low (mildly cooling) AC and low fan speed make a significant difference over a high (coldest) AC and high fan speed? Does fan speed have a noticeable effect on MPG to start with?
     
    #1 professorjay, Mar 20, 2009
  2. macalu

    macalu Member

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    i don't think the a/c fan speed has an effect on mgp. or at least it's just negligible.
     
    #2 macalu, Mar 20, 2009
  3. Lynus302

    Lynus302 Member

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    There probably is an effect, but I don't know as it's all that great. I read somewhere once that driving with your windows down (thus increasing drag and making the vehicle less aerodynamic) has more of a negative effect than windows up with the A/C blowing. I don't know how true it is but it certainly makes sense.
     
    #3 Lynus302, Mar 20, 2009
  4. CrazyJoeDavola

    CrazyJoeDavola Member

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    This was on Mythbusters
     
    #4 CrazyJoeDavola, Mar 20, 2009
  5. xcrunner51

    xcrunner51 Member

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    Mythbusters did this test and found that at 35mph+ it saves more gas to drive with the windows up and the AC running than windows down. Below 35mph the air drag isn't very significant.
     
    #5 xcrunner51, Mar 20, 2009
  6. Lynus302

    Lynus302 Member

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    Well....there you go. I knew I heard it somewhere cool.
     
    #6 Lynus302, Mar 20, 2009
  7. KingCheetah

    KingCheetah Atomic Playboy

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    I'd be more concerned with the speed of your ClutchFan.
     
    #7 KingCheetah, Mar 20, 2009
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