WMTIRE -
I'm not sure I understand your post. First you say
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Air, as with most gases, expands as it gets hot. If you know you are going to be in conditions that the tire will get hotter, it is a good idea to let a few pounds out before driving.
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The tire manufacturers seem to disagree with this - they say NOT to make a pressure adjustment for heating, real or expected. But then you go on to say
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Always check your tire pressure before trips, when it is technically cold pressure, to get an accurate reading. Make adjustments from cold pressure, not hot expanded pressures.
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Tire manufacturers agree with this - cold pressure is the only pressure that means anything. Set it correctly and leave it alone - don't adjust the pressure in a warm/hot tire.
Am I misunderstanding your post?
Bill