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Originally Posted by creseida
Thank you for the correction. I will make sure to tell my husband who is a Performance Application Specialist in the tire industry, that he has been using the incorrect terminology for the past 17 years. 
As for getting mileage out of tires, I replaced the original Conti's on my Boxster with 35,000 miles on them. Of course, I kept the car properly alligned, keep the tires balanced and properly inflated and 95% of the driving is "spirited" country road driving, and not much track time.
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I didn't mean to say your husband was wrong but I checked everywhere I could and the term
Performance Rating was never mentioned. I searched all the major tire manufacturer sites as well as the large tire resellers.
Performance Rating, by definition, would include many more factors than simply the speed and load ratings. The problem with something as subjective as a Performance Rating is there isn't an industry or engineering standard by which to measure one brand / model against another. Things like Speed Ratings and Load Ratings are finite and defined the the UTOG thus making it capable of being used accross tire brands / models.
If I'm wrong then please point me to a reference for
Performance Rating that explains the way it's calculated as well as the actual ratings themselves.