If you get 25k from Michelins
you are doing better than 98% of Boxster owners. I have about 15k on my Michelin Ribs and could get another 4k before they are down to the wear strips but they were made in 02/02 so next year I'll change them just for age reasons.
Feel the old tire tread. Did it wear evenly? Did the noise from the tire become more cyclical as it wore? You can get better mileage from a mileage-friendly alignment but you are already doing better than most of us so you may already have one. That and your driving style help you get mileage.
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