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Hi
I've got the 330i with the 255 Bridgestone turanza's also got terrible mileage and the only wore out in the middle. I played around a lot with preassure the first and second set of tyres and nothing helped. As a matter of interest, it wore out faster when a ran lower preassure.
After a lot of research the general consensus is that this specific tyre suffers from centrifugal growth. So like a dragster tyre middle of the tyre gets taller as speed hence the middle wearing out quickly. I'd suggest changing brands.
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