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  #1  
Old 06-27-2007, 09:01 AM
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fuel mileage

Does everybody's gas mileage suffer horribly when you use the A/C? Especially the 420sel. It seems I fill up now twice a week when before it was once a week. I cant calculate my actual mileage because my odo dosent work
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Old 06-27-2007, 09:14 AM
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My daughter told me that she had heard someone say that the AC actually hurts fuel economy less that the additional drag of driving with the windows down. Anybody else ever hear that? How about you engineers out there?
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  #3  
Old 06-27-2007, 09:24 AM
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Tie your daughter to the roof, that's what I do with mine. They get to live their green opinions and I stay cool. It also makes driving the car more peaceful.
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Old 06-27-2007, 09:29 AM
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Quote:
Originally Posted by Dee8go View Post
My daughter told me that she had heard someone say that the AC actually hurts fuel economy less that the additional drag of driving with the windows down. Anybody else ever hear that?...
I think that is true if you are driving at highway speed.
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Old 06-27-2007, 09:30 AM
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That's a good one! Actually, she's not one of those obnoxious kids who are always evaluating your every move against something they read in a magazine. Not yet, anyhow.

So, Bot, what do you suppose the drag coefficient of a teenage girl strapped to the roof rack of an SUV is?
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  #6  
Old 06-27-2007, 09:30 AM
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Quote:
Originally Posted by dculkin View Post
I think that is true if you are driving at highway speed.
Okay, that's good enough for me. I'll keep the AC on then.
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Old 06-27-2007, 09:48 AM
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Quote:
Originally Posted by Dee8go View Post
My daughter told me that she had heard someone say that the AC actually hurts fuel economy less that the additional drag of driving with the windows down. Anybody else ever hear that? How about you engineers out there?
I've read that.
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  #8  
Old 06-27-2007, 09:50 AM
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I keep the A/C off and the sunroof open for as long as possible, but the last few days have changed that policy some. My gas mileage has dropped. I don't know if its the new cat I just put on, or the effect of ethanol in the gas. It has dropped from 18 to 15, even without A/C. ECU duty cycle looks normal too.
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  #9  
Old 06-27-2007, 09:52 AM
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Yeah, we had it easy for most of June, but the "Washington summer" has come now, full force.
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OBK #55

1998 Lincoln Continental - Sold
Max 1984 300TD 285,000 miles - Sold
The Dee8gonator 1987 560SEC 196,000 miles - Sold
Orgasmatron - 2006 CLS500 25,000 miles
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  #10  
Old 06-27-2007, 02:19 PM
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On "MYTHBUSTERS" - they addressed this very subject...

If I remember correctly, windows down was better than windows up and AC on.

The compressor drag uses more energy, thus increasing the fuel useage...

The other situation that could be contributing to reduced mileage may be related to the fuel's reduced volitility during warmer weather and any additional ethanol in the fuel...-
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  #11  
Old 06-27-2007, 03:12 PM
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In one of my MB manuals, as I recall, they list the hp draw at max engine speed for the 150 cc compressor at 10 hp and the 173 cc compressor at 15 hp or thereabouts. Also, as I recall, the 126 bodies came in with a Cd of 0.39, which was supposed to be great for a car like that at the time.
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