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post #11 of 18 (permalink) Old 08-04-2008, 04:59 PM
 
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Default Re: Air Conditioning and MPG?

Have you seen the Chart here?
MPG Chart for A/C Comparison VS. Windows Rolled Down

40+ mph seems to be the point that it is better with the windows up and A/C on.
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post #12 of 18 (permalink) Old 08-05-2008, 10:56 AM
 
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Default Re: Air Conditioning and MPG?

how much help would a solar trickle charger help to keep the engine from coming on to recharge? is there a way to test this?
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post #13 of 18 (permalink) Old 08-05-2008, 04:11 PM
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Default Re: Air Conditioning and MPG?

Not nearly enough power to matter.

A news item a month ago talked about Toyota's plan to add optional solar panels to the roof of the new model (2010?) which would run the A/C, but consensus is that they only mean the fan, not the compressor. Same problem--not enough power.

2005 Seaside Pearl, BC#6
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post #14 of 18 (permalink) Old 08-06-2008, 01:46 PM
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Default Re: Air Conditioning and MPG?

I take NO hit on MPG with air. Can't tell the difference unless you open your windows. Then you will cause more drag and take a hit on mileage.

2006 Pkg. #3 Silver Pine Mica. Gobs of mods.
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post #15 of 18 (permalink) Old 08-07-2008, 01:30 PM
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Default Re: Air Conditioning and MPG?

I've tried it both ways down here in Florida and A/C costs me roughly 3 - 5 MPG depending on how hot it is. I generally keep my AC set to 77 and auto. I also believe that the sensor is off a bit because 77 feels much more like 72.
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post #16 of 18 (permalink) Old 08-07-2008, 03:22 PM
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Default Re: Air Conditioning and MPG?

Earlier in the summer, Arizona had a few weeks of 110+ degree weather, and mileage dropped to 42-44 mpg. Now, that it is cooler (105-10, mileage on our 2002 Prius has gone back up to about 48 mpg, short of the spring and fall highs of mid-50 mpg's. Can't wait for the monsoons to pass.
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post #17 of 18 (permalink) Old 08-07-2008, 06:56 PM
 
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Default Re: Air Conditioning and MPG?

Quote:
Originally Posted by Phoenix
Earlier in the summer, Arizona had a few weeks of 110+ degree weather, and mileage dropped to 42-44 mpg. Now, that it is cooler (105-10, mileage on our 2002 Prius has gone back up to about 48 mpg, short of the spring and fall highs of mid-50 mpg's. Can't wait for the monsoons to pass.

I'm interested in this suggestion that tires should be inflated to 42/40 and maybe even higher. Would you know if it's safe our intense summer temps?
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post #18 of 18 (permalink) Old 08-08-2008, 04:06 PM
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Default Re: Air Conditioning and MPG?

I had a set of Michelin HydroEdges that that I ran at 44/42 psi for 65,000 miles before replacing them early (still had about 10-15,000 miles left on them). I now have a second set of HyrdoEdges with about 10,000 miles on them that I have run at 46/44 psi since they were new (about a year ago).

In Arizona, the higher pressures (up to 44 psi max rating) make the tires flex less, which generates less internal heat -- So, in my opinion, this is safer. Besides, the higher pressure inproves my mileage about 2 mpg.

It's your personal choice, but there is no way I would run the factory pressures. The tires would wear out prematurely, with severely worn shoulders and lots of tread left in the centers. And, I suspect there would be an increase possibility of tread separation and blowouts.
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