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On my drive back from Spokane I had driven 200 miles and got around 19 MPG. I then noticed that the outside temp was 69 degrees. So I did a little searching and found the A/C button in the center of the console below the trip display. I turned off the A/C. The next 200 miles my milage slowly increased until it got home. I ended up getting 22 MPG for the trip as a whole.

This leads me to believe that the A/C compressor runs more than necessary to just maintain the temperature.

So I estimate that turning off the A/C is worth about 2-5 MPG. Sorry I don't have more imperical evidence. But I do know that the first 200 miles where reletively flat and the last 200 miles was through some pretty steep mountains.

I understand you can't turn off you A/C all the time.:D You need it when its hot/humid. But when you don't need it turning it off could save you some gas.:cool:
 

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A/C definitely consumes more power from your engine thus more gas.

Sometimes I found it also helps if you turn on A/C but shut off the rear A/C by pushing in rear A/C button on the dash board, then turn the dial to off position in the back A/C control panel. That way you got cool air blowing at your face and /or feet but not to the rear when there is no passenger in the back.
 

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You would need to do the entire trip a few times with and without the A/C, in order to trust your numbers. Even 2 MPG sounds a little high to me; the compressor only takes a couple horsepower from the engine.

Besides, you're driving a $40K car, for God's sake!! Crank the A/C, and enjoy the ride!
 

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Remember. I am really cheap. The only reason I bought a $40k car is because I feel that it would be cheaper in the long run than buying a $30k dollar piece of junk and replacing it piece by piece over the next 10 years.;)

Gas is expensive and I am cheap. :cool:
 

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bdespain said:
Remember. I am really cheap. The only reason I bought a $40k car is because I feel that it would be cheaper in the long run than buying a $30k dollar piece of junk and replacing it piece by piece over the next 10 years.;)

Gas is expensive and I am cheap. :cool:

I remember from a previous thread that if u remove the windshield and rear tailgate you can further reduce wind resistance and improve mileage.

Let us know the results :)
 

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Driving with the windows open increases drag and will probably negate the difference in fuel economy saved by turning off the A/C. The only difference I see is in POWER and acceleration.
 

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Discussion Starter #7
TheWorm said:
bdespain said:
Remember. I am really cheap. The only reason I bought a $40k car is because I feel that it would be cheaper in the long run than buying a $30k dollar piece of junk and replacing it piece by piece over the next 10 years.;)

Gas is expensive and I am cheap. :cool:

I remember from a previous thread that if u remove the windshield and rear tailgate you can further reduce wind resistance and improve mileage.

Let us know the results :)
Actually I have found that only driving down hill works great. But pushing up to the top of the hill sucks. ;)
 

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Gosh the thought of riding without AC is unimanginable - it is about 110 here in AZ!!! I am only getting about 17-18 mpg but the car is nice and cool! :cool:
 

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TheWorm said:

I remember from a previous thread that if u remove the windshield and rear tailgate you can further reduce wind resistance and improve mileage.
Although this idea should improve matters, there may still be some unwanted wind resistance, considering the roof, the front grille area, and the A-pillars are still in place. I suggest taking this a step further by following closely behind an 18-wheeler during the entire trip. Carefully adjust your uphill and downhill speeds accordingly. For best results, try to avoid a gap greater than 5 feet between yourself and that 25-ton trailer. You'll soon be getting the fuel economy of a sport sedan! :)
 

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But it's a dry heat.

Allison said:
Gosh the thought of riding without AC is unimanginable - it is about 110 here in AZ!!!
Yeah, it's 110, and I can hardly wait for summer to finally arrive! These 76-degree nights are too cold! :rolleyes:
 

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I tried a little experiment today although not very scientific. We have a 6 mile, flat straight stretch of freeway near my home. I ran it both ways today with virtually no wind. With the AC on (100F day) the mileage- o-meter (2.5 mpg granularity) hovered between 22.5 and 25 mpg. With the ac off it hovered between 25 and 27.5 mpg. Each run was about 3 miles long for each setting. To turn the ac off I used the dash Off button and back on with Auto. Results were the same both ways. So maybe running both A/C units can account for around 2-3 mpg.

Chris
 

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MGTD

Thanks for the "experiment", it's scientific enough for me. I'm not suprised that their was a difference but 2-3 MPG was a little higher than I thought it would be. Thanks for sharing. :D
 

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Re: MGTD

mr1margarita said:
Thanks for the "experiment", it's scientific enough for me. I'm not suprised that their was a difference but 2-3 MPG was a little higher than I thought it would be. Thanks for sharing. :D
It's hard to tell if it was 1 1/2 or 3 gpm because the gauge only shows in 2.5 gpm increments. But I do think it makes a measurable difference.

Chris
 
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