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Try using a 1-2" opening on both the driver's window and the right rear. Minimal aero drag, but lots of airflow through the car. If you need more, go to 4" driver and 2" on each rear window. That's how I handle the Texas summer with no AC, so I can assure you that it works.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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