Tires should always be checked and adjusted COLD. Every tire mfr will tell you that.
About five years ago I worked on a project with a Continental tire engineer where we were going around giving information seminars at dealerships regarding the new run flats on BMWs. He spoke of a tip that I use to this day; for a daily driver, for any type tire, always fill when cold, the tire with 1 to 2 pounds more than what is required on the door sill. You get 10-15% better mileage and no problems with wear or handling, it's basically imperceptible.
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