I have a 2000 Marquis, and my tire pressures are 120 PSI for 295/80/22.5 Michelins all of the way around by weight specs. I have a TPS system and I try to maintain my tire pressure based on an ambient temperature of 60 degrees F. So I check my tires early in the morning if possible to get the cool temperature. However, when I leave my house in the Phoenix area in a week or so for the summer, it will probably be in the 90s and my tires will probably have 125 PSI in them when I drive out the driveway.
Gerald