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The car's recommended pressure is most definitely NOT right. My last set of tires, rated 44 psi, I ran them at 35, while the car called for 32. The wore out on the edges more than in the middle. That's above the recommended pressure, and it was still too low.
The question that remains is this: How much higher than this would be the best compromise between tread wear, traction, tire fatigue, and mileage?
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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