I think the tyre choice has a lot to do with it. I had a set of Hankook K415s on my previous 380 SX. I put about 14,000 km on them before selling the 380 and they looked like new - admittedly it was mostly highway kms. I think 70,000 km out of them would have been achievable. Off the top of my head the Nobles would be more performance orientated than the K415s I had.
Just for what it's worth I replaced my PS3s on my old 380 GT at 40,000 km. Had about 2.5 - 3 mm tread left but I don't believe in running tyres down to the wear indicators. Was even wear across the tread and ran about 38 psi too. This was in 245/45/18 though. Having said that they're brilliant tyres and good value for money, I'd buy them again if I had another sedan.




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