yes . I kept getting ON STAR emails in june and aug that the pressure was ok eventhough it was anywhere from 224 to 242. Then when I went to the dealer two months after buying the car they said there was only 30lbs in each tire so they filled it up to 36. Then last week , ONSTAR again shows less than 248 (238-244) but again gives the green checkmark as if its ok. Left rear is lowest with 238 right now.
Guess nitrogen is the key.