With my Vibe, the AC doesn't really hurt my MPG, but I still don't like the jets of air spraying on me. The past few days have been the hottest in Minnesota for quite some time, with heat indexes of over 110 degrees F. Not one of those days have my HVAC controls moved from OFF. With my window vent visors, I can keep my windows slightly open for the breeze while at work. The windshield is blocked by my sun visor, and my sunroof has the cover closed in the sun. Once I start driving, all my windows are down to let the heat out, and once I'm up to speed, they're only half-down. I've been perfectly cool the whole time!
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