I'm normally just quoting numbers on or near BMW recommended air pressures based on size and model of vehicle.
Generally running higher air pressures can make the tires feel more responsive, but will cause the center of the tire to wear faster than the shoulders.
For all seasons like the tires you have now I've been very impressed with the new Pzero Nero M+S, and like the Sumitomo HTR+ as well. For summer only tires, the Bridgestone S-03 or Goodyear F1GSD3 have both been fantastic.
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