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I usually run "T" speed rated tires on my 740 non-turbo and on my 850 non-turbo. (Both cars came with "V" rated tires as OE) I typically get at least 40,000 to 50,000 miles on these tires with 50-50 city highway driving. I like the "T" rated tires on my Volvos because they usually me with a "less harsh" ride and they are usually less expensive. As the other reply mentioned, speed rating of a tire will affect it handling capability (more precise handling due to the stiffer sidewalls) and it's capability to run at sustained high speeds without falling apart. Technically, you won't convince the tire dealer that "T" speed tires would wear faster than "H" or "V" speed rated tires. It is usually the other way around. It's possible that a really cheap "T" rated tire could have a tread design with grooves that are not as deep as other higher priced tires, thus reducing the treadwear. If all four of your tires had this fast wear I would suspect that the tires had a fast wearing tread rubber. If only the front tires had this wear, I would suspect something in the suspension, alingnment, inflation, etc.
(Most American cars come with "S" or "T" speed rated tires to reduce the cost and reduce the rolling resistance due to the government's requirements for fuel economy. Most European cars come with higher ("H" or "V") tires because they usually drive more aggressively and don't have the fuel economy laws that we do.)
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