Look at passive systems first - keep the car from getting hot in the first place. Windshield reflector, park in the shade, crack the window open when you part, etc. Those three give me a measured difference in interior temps - down from 125F to ambient 100F. The lower you start, the less work your gadget has to do / the smaller it can be.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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