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using ac or windows down on freeway?

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Old 09-09-2011, 12:22 PM   #1
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using ac or windows down on freeway?

So rumor says vehicles use more gas to have Windows down on freeway due to the extra drag. I'm wondering if anybody with scanguage can confirm if it trully uses more gas then running the AC? Thanks
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Old 09-09-2011, 12:24 PM   #2
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Originally Posted by Twiostaco View Post
So rumor says vehicles use more gas to have Windows down on freeway due to the extra drag. I'm wondering if anybody with scanguage can confirm if it trully uses more gas then running the AC? Thanks
Yeah I know that one. I don't buy it.
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Old 09-09-2011, 12:26 PM   #3
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Mythbusters did a show on this. When I had my RX7 I tested this theory. On a long straight road I set the cruise and watched my vacuum gauge. With the windows down there would be less vacuum at the same speed meaning the cruise had to use more throttle to maintain speed. With the AC on the vacuum stayed high.
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Old 09-09-2011, 12:29 PM   #4
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Originally Posted by whippersnapper02 View Post
Mythbusters did a show on this. When I had my RX7 I tested this theory. On a long straight road I set the cruise and watched my vacuum gauge. With the windows down there would be less vacuum at the same speed meaning the cruise had to use more throttle to maintain speed. With the AC on the vacuum stayed high.
I guess there is a bigtime difference between one driver window cracked half way and both windows all the way down.
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Old 09-09-2011, 12:30 PM   #5
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I say 'who cares!?' I drive with all the windows down, all the time, on the highway and off; even during the winter when the temp permits
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Old 09-09-2011, 12:32 PM   #6
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Most of the time I roll with the windows up and the vent open so I can hear my music but there are days where the windows just have to go down or else the day seems just wrong.
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Old 09-09-2011, 12:35 PM   #7
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Windows down and music blaring FTW.

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Old 09-09-2011, 12:35 PM   #8
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i like to hear my music too so i just crank it up a few notches
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Old 09-09-2011, 12:35 PM   #9
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Windows DOWN--music UP--Better MPG with AC--is a MYTH
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Old 09-09-2011, 12:35 PM   #10
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On my buddys e36 it has a live mpg needle, doing 75-80 it reads 18-19 with the windows down, with the windows up it reads 23-24. and 21-22 with ac on.
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Old 09-09-2011, 12:36 PM   #11
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I rarely use a/c, Usually windows down or cracked and/or vent open.
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Old 09-09-2011, 12:38 PM   #12
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Quote:
Originally Posted by newertoy View Post
Windows DOWN--music UP--Better MPG with AC--is a MYTH
Explain mythbusters, my findings and other's findings.
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Old 09-09-2011, 12:52 PM   #13
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Quote:
Originally Posted by whippersnapper02 View Post
Explain mythbusters, my findings and other's findings.

obviously a myth



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Old 09-09-2011, 12:57 PM   #15
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Quote:
Originally Posted by Jester243 View Post
obviously a myth



Damn. It must be.
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Old 09-09-2011, 01:02 PM   #17
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Old 09-09-2011, 03:56 PM   #18
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Quote:
Originally Posted by whippersnapper02 View Post
Explain mythbusters, my findings and other's findings.

Mythbusters, a teevee show, did an experiment to see what uses more gasoline. I believe they found it doesn't matter but YMMV.
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Old 09-09-2011, 04:07 PM   #19
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Quote:
Originally Posted by 08TacoTrD View Post
Mythbusters, a teevee show, did an experiment to see what uses more gasoline. I believe they found it doesn't matter but YMMV.
Actually they found out that the truck with the AC on used less fuel thus getting better MPG than the truck with windows down. I don't remember what the difference was though. But my own tests with my other car showed better MPG with the windows up. I haven't tried it on the truck yet.
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Old 09-09-2011, 07:29 PM   #20
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I saw this on mythbusters, and from what I remember if you are going over 40 (obviously you are on a freeway) you save gas using the a/c
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