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mpg with the temp of the air cond

Discussion in '2nd Gen. Tacomas (2005-2015)' started by bra, Oct 24, 2008.

  1. Oct 24, 2008 at 12:01 AM
    #1
    bra

    bra [OP] Well-Known Member

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    Hello, just a question about the airconditionner, does anybody know when and why the A/C suck fuel? I don't know if it more we cold the temperature or when we put the fan on the hi or low position.
    Do you think it will increase the mileage if we don't set the temperature too cold?
     
  2. Oct 24, 2008 at 12:53 AM
    #2
    Justin626

    Justin626 Well-Known Member

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    When you turn on your A/C, it engages the clutch on the A/C compressor. It causes more drag on your engine, in turn making the engine work harder. If you just turn the temp knob to cool, it won't be as cold as your A/C, but it also won't affect your gas mileage.
     
  3. Oct 24, 2008 at 6:14 AM
    #3
    Zombie Runner

    Zombie Runner Are these black helicopters for me?

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    A/C on = lower mpg in city driving.
    the temperature or the fan speen will not make a dif.

    Mythbusters did a test between two identical trucks. one using a/c and one with the windows down while driving on the highway. the one with a/c drove farther than with windows down. Im not sure how far it was, I think he drove for about 40 more mins.
     
  4. Oct 24, 2008 at 6:34 AM
    #4
    Brunes

    Brunes abides.

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    The over under speed is usually about 40 mph (rough estimate).
    If you are going BELOW 40-keep the windows open because the drag from the open windows is less then the drag on the engine of the AC compressor.
    ABOVE 40-Roll up the windows and turn on the AC.

    And +1 about the temp not mattering.
     
  5. Oct 24, 2008 at 6:57 AM
    #5
    Ridgerunner

    Ridgerunner Well-Known Member

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    Back in the older cars (say Buick and Olds etc) the A/C could draw up to 20 HP off the engine to run the compressor. Now, ours are much more efficient and only draw 5-10HP when the compressor kicks on. You can feel it mostly on a slight incline where HP becomes challenged by the hill itself as well as windage, then you add the third variable of the A/C engaging, there's that instantaneous slight drop in power for like 10 seconds then it comes back and so on. This is not that noticeable on our trucks with the V6s, but the I-4s will feel it a little more...but still not as badly as the small cars with say 130HP or less. That A/C still requires the same draw of power and the less overall power your engine has the more you'll feel it.
     
  6. Oct 24, 2008 at 7:35 AM
    #6
    camsbored

    camsbored Well-Known Member

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    Also, turning the temp knob warmer does not help mpg if the AC is on... it's just a way for the girlfriend to annoy me by inefficiently warming previously air conditioned air.
     
  7. Oct 24, 2008 at 7:58 AM
    #7
    lsocoee

    lsocoee My hair is all natural Moderator

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    I sweat it out with the windows up and the AC off. Occasionally, I'll roll the windows down and swap out the air for a minute, but then the windows go back up.

    As for the mythbusters, there are far too many variables for me to believe what they say when it comes to this.
     
  8. Oct 24, 2008 at 8:34 AM
    #8
    allrsdup

    allrsdup Well-Known Member

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    why would u leave the windows up and sweat it out? just does'nt make sence u have ac use it. :confused: how much money do u think u are saving getting all gross and sweaty in a closed up truck when its hot out. :rolleyes: i just dont get people like u. but hey maybe u like sweating? :D
     
  9. Oct 24, 2008 at 8:49 AM
    #9
    lsocoee

    lsocoee My hair is all natural Moderator

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    I don't sweat that much, and it isn't really that unpleasant. Assuming $3.6 for gas, I spend $10.26/day to commute without AC. With AC, I'll be spending $11.34/day. So to answer your question, I don't know I bother, I waste way more than $1/day.
     
  10. Oct 24, 2008 at 6:30 PM
    #10
    bra

    bra [OP] Well-Known Member

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    Oh really? Are you sure?So I can turn the temp in the maxcold position and the fan on the hi position and it will not affect the mpg? I will maximise next time my a/c if there are'nt difference with fuel comsuption :D
     
  11. Oct 24, 2008 at 6:57 PM
    #11
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    The temp is controled by mixing the cool air with air heated by the coolant. With the fan running on "High" there might be a mpg penalty as its useing more electricity, thus putting more of a load on the alternator.

    All things considered, running AC isnt going to hurt your mpg THAT much. If you need the extra .5 mpg, you should have considered a different vehicle. :rolleyes:
     
  12. Oct 25, 2008 at 8:55 AM
    #12
    allrsdup

    allrsdup Well-Known Member

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    i agree this is a retarted conversation in the first place.
     
  13. Oct 25, 2008 at 10:14 AM
    #13
    TSUNAMI*22

    TSUNAMI*22 Obama can suck-it

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    *retarted? :laugh: Don't you mean retarded?

    It's not a stupid thread. It's a valid question that deserves a valid answer.

    In simplest terms: A/C on = worse gas mileage than if it's off, due to reasons stated in the above posts.

    In addition, your mileage will suffer much more greatly from every 5 mph increase in speed after 55 than A/C will ever hurt it at any speed. I've seen big drops in gas mileage with my scanguage tool when reading between speed increases. It's amazing what wind drag will do to performance.
     
  14. Oct 25, 2008 at 10:35 AM
    #14
    CtryBoyInMT

    CtryBoyInMT Lifetime Member

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    To only add more technical information to this thread, the environmental selector may make a difference in the mid 50/50 position as the AC compressor will engage when the Freon needs to be pumped into the condenser for cooling to take affect. It will cycle on and off as needed. So if the incoming air is already cool, the compressor may run for 10 mins, off for 5, on for 10 and so forth. If the incoming air is warm, it will run continuously. So in recirculation mode with full heat, the air will effectively be warm, fed through the condenser (cooled) and heated again to the environmental setting.
    But now were talking technical, not rational; as it would account for only hundredths of a penny in fuel difference (even at $3.6/gal).
     
  15. Oct 25, 2008 at 5:07 PM
    #15
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    The AC compressor cycles more or less due to the pressure its building in the system. It has nothing to do with the temperature.
     
  16. Oct 25, 2008 at 10:08 PM
    #16
    Rich Swanner

    Rich Swanner Well-Known Member

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    Recycle gives you more cold air, but run regular vent to dry out the coils before you shut off , turn off the AC a little bit from home and leave on the fan..Rich ....City MPG does suffer, but you bought the truck to be Cool....LOL
     
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