I'm at a high elevation and I'm not sure if that has any play on the pressures but if inpump my factory 20" tires to 32psi in the rear, then the middle of my tires wears very fast. I reduce mine to 28psi and get better even wear. Fronts I leave at 32 psi

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I swear, my cars are like a girlfriend.
Sometimes its a rough ride, sometimes its smooth motorin'.
Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
BUT at the end of the day, she loves it when I am inside her.

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'91 850i
'05 X5 4.4i
'09 Clubman S