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How does using your AC effect your gas milage

Discussion in 'The Garage' started by Calclips, Jul 25, 2002.

  1. Calclips

    Calclips 1/2 ton status

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    How much more gas does your truck suck when your running the AC? Is it a noticable impact, or is that just an old farce?
     
  2. Skigirl

    Skigirl 1/2 ton status

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    Dunno, but if I get less mileage than I do now, I'll be getting gallons per mile (GPM) /forums/images/icons/tongue.gif
     
  3. 69K5

    69K5 1/2 ton status

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    you mean you can measure how fast the gas gets sucked through. my eyes arent that fast.
     
  4. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    I've heard that at cruise on the highway you burn less because you have the windows rolled up and less drag.
     
  5. Bubba Ray Boudreaux

    Bubba Ray Boudreaux 1 ton status

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    The A/C compressor, when engaged takes up some power, so the engine has to run a little higher rpm for the same speed. Now with the windows down, all the air is going somewhere, right inside so there's drag, but I haven't seen a real big difference in mileage between A/C down the highway, compared to no A/C with the window up.
     
  6. loudnowlouder

    loudnowlouder 1/2 ton status

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    yeah you're right
    after about 35 mph the drag with the windows down will suck more gas than the a/c running...probably wont feel much power difference, but if you're on a long trip you might notice it...
     
  7. Scorpion

    Scorpion Registered Member

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    I'm sure the biggest difference in gas milage is when you are stop and go. I can't remember the exact figure but the A/C compressor costs about 10 or so ponies when it's off and much more when it's engaged. I would imagine that a motor that doesn't even have a compressor would get much better milage than one that has one and is on no matter what the driving conditions.
     
  8. jekbrown

    jekbrown I am CK5 Premium Member GMOTM Winner Author

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    drag from the windows being down prolly wouldnt be too fierce if the hard top and tailgate were off... and there was no rear seat. /forums/images/icons/tongue.gif

    J
     
  9. chulisohombre

    chulisohombre 1/2 ton status

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    i dont have ac onmy 5k,but the wife has it on her car.you get about a 10 to 15 percent drop in gas milage using ac as if you dont use it.we get about 20 mpg without 15 with it.i cant stand being too hot so if i can use it i do.i say,"**** gas milage if you can be comfortable" at least if it is a long trip.but for a trail rig i wouldnt have it.just sucks more power that can gop to the wheels /forums/images/icons/laugh.gif
     

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