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Cold. That's what the tires are rated for, and what the car calls for. If you set the pressure when they're hot, the next morning you're underinflated.
Tire wear: higher pressure has not worn my tires in the middle on my last three sets. I've found it to extend the life of the tires as well. These are all passenger tires, LT might be different.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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