I have a strange problem, when it gets cold 20 & below my LR TPS says the tire is low (30 vrs 34) I drove home watching & as the tire got wamer presure came back up to 34. This happened about 3 times & the one time I added air it went to 37 when it warmed up?

 

Its normal, Cold weather promote's leaks as well. Make sure u manually check your tires often and you should have a problem. Air is very unstable thats why most luxury cars are running nitrogen now.

 

In my opinion 34 psi is too low a pressure for your tires. I normally run 40 psi in mine and when loading heavy run 44.

 

This is why I get very mad at the oil change place when they check tires. (I do my own changes on my vehicles, but not the company vehicles). The truck comes in off the highway. Tires are hot, which means they will read high. What do the guys do? LET OUT AIR. Now my tires are low.

Cold weather really messes with air pressure. When my truck did the same thing, I went around and checked the pressures and brought them back up. I run 38 PSI in my 07 NBS 4x4, stock tires.

 

Yeah! 34 psi is less you fill it upto 40 or 42 psi. Its a heavy vehicle.