I have 36psi both front and rear for a year now and its good for me!
I have 22" rims bolted on my X (285/35/22)
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'01 E53 4.4i exe sport >155K-miles [daily driver]

'00 E46 323i sport >90K-miles [sold]
'01 LR freelander 2.5 V6 >90K-miles [sold]