BTW, I find that the TFT speed reading on my 2020 RR is uncharacteristically spot on instead of the usual significantly higher/optimistic. I've looked at it next to the GPS speed from Nav apps and my Escort Live app on my X-Grip mounted phone and find it to be the same. I wonder if it is GPS sourced instead of based upon wheel speed.
I find the BMW Speedo to be very close to GPS verified even at high speeds. Really really close.