When I received my Model 3 it had over-inflated tires that my accu-gage showed at 49-50psi. I dropped tire pressure on all 4 wheels to 42 psi (again per my accu-gage).
Now that temps are getting colder, TPMS sensors are tripping alarms in the cockpit. TPMS sensors showed that all four wheels were between 37-39psi. I put my gage on and it shows that they are at 42-43 psi. So, I aired them up to 45 psi (per my gage) and the vehicle is now reading them at 39-40 and still shows them in alarm.
A couple of points here;
1. There should be a way of calibrating the TPMS sensors if they are clearly off by a substantial amount from real world measurements.
2. The low pressure threshold throwing warning alarms at *gasp* 39 psi is absurd. Especially considering that this is OVER the tire pressure that many TRUCKS run at that weigh substantially more than Model 3.
3. The extremely high tire pressure is probably good for squeezing out a bit more efficiency, but it's laughable that Tesla is forcing this with super high TPMS thresholds when they also offer 19 and 20 inch factory rims that have a far bigger impact on efficiency then choosing to run the tires at 40-42 psi to improve the ride characteristics (harshness) that come with super high tire pressures.