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I just had a general comment, not Boxster specific. Pressures are adjusted to maximize grip, not reduce rolling resistance. You generally want an even temperature gradient across the tire contact patch, with the inside being hotter than the outside. In some instances higher pressures are required to prevent tire "roll-over" in heavier cars. The pressure also changes the spring rate of the tire, lowering pressures on a cold day can gain mechanical grip thru more tire compliance.
Steve
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