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If I were you, I would stick with the factory recommendations for now. Lower the pressure and you will start affecting fuel economy and excessive wear on the tires. Too much pressure and you will have an improper wear on your tread and risk catastrophic failure of your tires. The best thing to increase performance (tire wise) is to purchase a set of performance tires. I understand that this is not a great answer, but its the best that I've got. Good luck.
I am probably not the best of them and I hope to God that I'm not the smartest...
I used to run 5 under max no matter what for years, only recently I have been airing them up to what's in the door.
My only real problem is that when I drive on the MANY backroads of Tennessee, im noticing areas where the tire rolls over the sidewall at 32psi. Im running 35 now and it doesn't seem to do it as badly now.