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I've inflated my winter set (same wheel but with ipike tires) based on the gas cover numbers "normal load" target PSI of 31. I inflated cold on a upper 40f day to 34 psi to account for cold weather psi drop. We dont run the car fully loaded with passengers/cargo and on winter tires do not exceed 100mph.
Somewhat related question... I'm about to go to the dealership to swap from all-season to winter tires too. However, these 20' wheels have different offset, while the tire size is the same. How easy is it to screw up the wheel placement on the dealer's side? I'm considering highlighting it when I bring the car in and maybe even placing stickers on rear wheels to make sure they stay in rear. There doesn't appear to be an easy way to check part number when the wheels are mounted.
stktyz, offset will vary from wheel to wheel from the OEM selection depending on the style. Front and Rear part numbers will be slightly different (ending 200 for the front 300 for the rear for example). The techs, hopefully, will be installing them accordingly. I wouldnt worry too much about it.