My 997 is about 3psi low cold , about 1psi hot .
But it’s consistent , when measure with a long acre gauge .
Out , but consistent .
I can work with that , as it’s good enough to see when they’re upto temp .
The Range Rover that just got wrecked even monitored the spare .
Great idea , after all what’s the point in telling you you’re losing pressure in a tire only to find out your spare is flat !!
Unfortunately , it’s a Range Rover so just added a 25% complication to a system that didn’t work properly
42 psi in all tires , and a 15 minute run sorted it out every time .
I blame firestone and the Ford Explorer ...