The big difference with the GTR is the way the AWD is set up.
The ATTESA E-TS is pretty unique, and during the vast majority of the time, ~98% of the power is going to the rear wheels. You will actually see guys throw ATTESA codes when running mismatched tires, or if they are driving in such a way that they are seeing a pretty even tq split.
On a car like a WRX, you have a viscous coupling F/R that will overheat and grenade itself if you mismatch F/R. On the GTR, you are looking a slightly increased clutch wear, and it really is only ramping up wear when it is actually engaging AWD. The combo of a very small difference combined with how infrequently power goes to the front wheels means that you really don't see much extra wear.
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