The car is brand new with yoko from original.I think you're fine running the recommended pressure. That's what I've always done and haven't had this outside wear problem..... If your alignment is good, your suspension is in good order, and you rotate your tires like you should you should be fine on wear.
Some advantages of running higher pressure
Increased fuel economy
more responsive feel (b/c the tire flexes less and responds faster)
Some disadvantages
reduced grip (b/c the tire can't flex and stay in contact with the road as well)
increased risk of impact damage
Summers get very hot and humid ,doesnt that increase psi ?