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I have 269,000 miles on my 2002 Q45 Sport.
I replace the Kuhmos every 40-44k miles.
From personal experience alone, I can tell you that worn tires suck.
I'm just not going to trade .001 better mpg for the risk.
Pump up to 45 psi and use nitrogen. And run tires w/ tread.
ANd buy a scangauge.
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