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Sorry about my misdirection. I did not think you'd be able to get enough resolution with the ABS sensor to determine the status with RFT. It's been used on cars with 'normal' tires for quite awhile.
FWIW, on the vehicles I've had with TPMS, I've never had to replace one, and they've lasted 6-8 years when I finally got rid of the car. I have to say, though, that this is the first BMW with them, but BMW doesn't build them, they buy them from someone else, that also sells them to others. Only thing may be the exact frequency or protocol, but that's probably a simple internal programming thing.
I'm guessing you don't have the car yet? It would be easier to just verify by looking if you had.
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