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Edit: Something to note, this article seems to have no empirical testing, which I think is important in this kind of situation. Issues related to tires and fuel economy can often have the books cooked via mental exercises, which, while seemingly sound, are crucially lacking various pieces of the puzzle. Colour me skeptical.
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I'm always skeptical which is why I will keep looking for better and better info on this. Please post better info if you have it. My later post has actual data although they didn't test above max sidewall.
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1) Unfortunately, had they done a little research, they would have found this:
Fact or Fiction? Tire contact patch and air pressure.
That directly contradicts Item #1 - and has data to back it up. So it isn't a myth!
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True, It does contradict item 1, but not the statement that inflation pressure does not affect grip. Obviously this is a general overstatement. Inflation pressure does not affect grip (very much). Let's find more info. I'm not completely satisfied by the AutoSpeed article or the one you posted.
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