If you have an RT with the MXM4 Michelins 225/55R17,V95 , the door says 30psi front and rear. The owners manual says to increase pressure to 35psi if sustained speed at or over 85mph is expected (imagine that). That note applied to all models of Intrepid regardless of tires. So it seems anywhere between the door label and 35psi would be fine. I had my RT at 35 for a while. The ride seemed a little harsher so I went back to 30psi. I believe in the door label since it usually takes the widest range of situations and installed original equipment in mind.