Quote:
Originally Posted by Daox
The best way to use A/C is put the temperature control on full cold. Then, turn your fan on the lowest speed setting to stay comfortable. However, the fuel economy hit can still be pretty drastic. Some reports say up to 30%. I find it much lower in my experience, but I use it very minimally.
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Also, set the A/C on "max" or "recirculate". Then you won't be dumping cooled air outside your car. And if you can can control the compressor; turn it on until it's cool enough (preferably when going downhill or decelerating); and leave it off until you're uncomfortable.