Those door jam numbers aren't just picked from the air. A lot of testing went into picking what works best. The tire itself only supports about 50 lbs. The other 1500 is supported by the air. Look at the revolutions per mile on the tire charts, at 60 mph your tire is flexing that many times per min. for hours on end. That's why they get hot. Having the wrong pressure does more than waste gas. It's very hard on tires.
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