I was surprised when I was driving my 2016 Charger the other day and scrolled down to the tire pressure display on the dash. There was a substantial discrepancy in the readings. One was high enough that when I stopped for gas I bled a little bit of air out of the tire. So last night after washing it, I checked the tire pressure. I made sure all were exactly at 31 according to my digital gauge (which reads about a pound low). Then I started the car and scrolled down to the tire pressure display. The readings were between 32 and 37. In my mind, that's way too much of a variance and is certainly useless for keeping an eye on tire pressure. I check mine religiously and would never rely on the dash readout, but still, that's too much variance to be acceptable.