Sorry! For some reason, I missed the page! :icon_redface:
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ckimmerle, as the other members have written - and as regajohn picked out very specifically - yes, the OEs do spend some resources to work with their selected tire manufacture to tune the vehicle/tire combination to suit their desired characteristics.
Exactly what those traits are, however, I do not know in terms of our Subarus, and I am truly not sure if any "technician" at the level of can really say. All that I can relate is that I saw/felt first-hand the differences that this OE-level of tuning did on the Dubai Autodrome, in high-end performance vehicles driven hard by factory test-drivers who each was specifically assigned to tune that specific tire for the vehicle manufacturers' desired performance traits.
Whether these differences can be seen or even generalized accurately in a general vehicle service bay? That I cannot say......
Everyone's here to learn, including me!!!! 
