Temperatures have been dropping in the Boston area over the last few weeks and of course the temp affects tire pressure. I noticed the front tire of my daughters car looked a little low so I checked and sure enough all of her tires, my son's, my wife's and mine on the TLX were low. I filled all to recommended pressure. A couple days later before driving (tires still cold) I scrolled to the tire pressure readout screen and all of my tires were reading 37-38 lbs. I checked with my good ($$$) tire gauge and they all read 32 lbs, just in case I used a different gauge and that one said all at 31-1/2 (close enough) so bottom line I wouldn't trust the read out the car gives for tire pressure.