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Thread: quick quest for science boffins

  1. #1
    Regular Member craigbarlow18's Avatar
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    Default quick quest for science boffins

    If a car uses X amount of extra fuel with the windows down at 70mph and Air Con uses extra fuel due to pump.

    Which is actually cheaper.

    Not like im tight I was just curious are modern a/c pumps better for fuel consumption than older ones from the 90's??

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    Regular Member al21784's Avatar
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    Vehicle : Vectra c

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    Default

    If i remember rightly, Mythbusters (discovery channel) did such a test, i seem to remember the windows down was cheaper.


    AL

  3. #3
    Regular Member craigbarlow18's Avatar
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    Default

    mythbusters. they think of everything lol.

    Thanks to them I know another fact, much like jumping in a falling lift wil not save buster nor me lol.

    Thanks al

  4. #4
    Regular Member al21784's Avatar
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    Vehicle : Vectra c

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    Default

    Not a problem


    AL

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    Regular Member redraptor_141's Avatar
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    Default

    Mythbusters Geek here!



    They found out up to 56mph its cheaper with ALL the windows down. after that the drag of having the windows down superseeds the fuel the A/C on max uses. so if your on the duel carriage or motorway then use the aircon if just pootling then use the Windows.


    (still i prefer the windows open to the Air con anyday!) just a nice feeling with the wind blowing in

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    Regular Member Big Knox's Avatar
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    AC vs. Windows Down
    Adam and Jamie tackle not so much a myth as what they call an "urban puzzle". The debate arises because both methods of cooling influence a car's fuel efficiency—air conditioning requires a lot of power to run, but at the same time, open windows create drag.

    Revisited in MythBusters Revisited, Season 3, episode 38
    Myth statement Status Notes
    Running a car with air conditioning on is more fuel efficient than running with the windows down. Partly Busted Tests were performed under varying conditions (55 miles per hour (89 km/h) versus 45 miles per hour (72 km/h)). Also, the 55 mph test was using a computer to estimate fuel efficiency based on air intake, not actual fuel consumption, and showed A/C was more efficient. The 45 mph test consisted of running the tank until it was empty, and showed open windows were more efficient. This experiment—or one like it—is sometimes cited by the Magliozzi Brothers on Car Talk when presented with this question.
    Should be noted it's taken from wikipedia (lol)

    The fundamental flaw in the MythBusters' test was that the point where the drag becomes powerful enough to inhibit a car's performance with windows down was inside their 45–55mph margin at 50mph. Going less than 50mph it is more efficient to leave your windows down, but going greater than 50mph it is more efficient to use your A/C.

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    Regular Member solorider's Avatar
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    i would rather have the a/c on,and i think you will find the mythbuster are busted,they tend to use big v8 cars and their figures may be correct,as to our smaller cars you may find there will be a difference and as the drag is increased as you go faster and our smaller cars are more aerodynamic the speed will be a lot lower as the windows down will increase drag more

  8. #8
    Regular Member Flaninacupboard's Avatar
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    Default

    also, who uses A/C on "Full"? i know with mine the compressor is not on that often unless it's a very hot day.

  9. #9
    Full Member lizard's Avatar
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    my air-con is on all the time, sod the cost, comfort wins..

  10. #10
    Regular Member craigbarlow18's Avatar
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    Default

    well i was under the impression eco mode didnt put any ac on at all, i tend to leave mine on full auto set at 16 - 20'C. c/c is easier to set and forget about lol.

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