From door frame I see the tire pressure is marked as 33psi however the tire real pressure is 39-40psi since I picked up my car 10 days ago, which is correct? What’s yours?

 

33 is correct. Tires are overfilled when the cars are shipped, and the dealer is supposed to check the pressure as part of its pre delivery checklist. They often do not do so, which makes me wonder what other steps they skip.

 

The door jam says 33 psi for the 350h run flats. But many dealers typically add 2-3 pounds to the recommended psi for conventional tires figuring better to have a couple pounds more than less since ambient temperatures can have a wide range from week to week. I’m curious what 350h owners who pay attention to their tire pressure are doing. I normally keep 2 pounds above on my cars but they have not been run flat tires. My concern is that every pound increase could make a harsher ride that much worse on the run flats. But I don’t own the NX yet so can’t judge for myself and wonder about the experience of existing owners. Thanks.