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Do you really give a shit when you are sitting in a cool comfortable environment.
Ever had heat stroke from being in a car? Don't recommend it, but can tell you how much it cost in Arizona to get re hydrated with a few bags of saline. Thank God I had medical insurance.
EDIT: that comes across as confrontational, it is not. Have experienced it and really don't want to again. Dehydration is a real issue while driving.
I’d imagine a/c has a negligible impact on fuel economy in most modern cars