My Pirellis seemed to do best at about 30 PSI, those were run-flats. Garbage tires, until one went flat and I was able to keep driving (finally saw the value in run-flat tires).

My new Toyos I've been running at 34-35 PSI.

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2002 X5 4.6is - Titanium Silver / Black Alcantara - Dinan Stage 2 - Bilstein/Eibach - Brembo BBK ----SOLD---
1993 318i - Brilliantrot / Tan - bone stock daily driver