fwiw, my 2019 BMW i8 has tyre sensors... travelling south from Glasgow on the A74 & M6, after 90 minutes at steady speeds I drove into heavy rain. 20 minutes later I had simultaneous pressure warnings on all four tyres.
I guess the rain had cooled the tyres & dropped the pressure a smidge.
But it does suggest that even when the system's working, BMW's tyre pressure warnings need to be taken with a hefty pinch of salt, which kinda defeats their purpose.
iirc @Shooter puts a motorbike anti-puncture gel into his tyres - which seems a lot less hassle than a pressure warning system.
Will
