I don't know about the R1200R, but the R1200GS uses a fuel sensing strip instead of a float to measure how much fuel is in the tank. Many GS owners experienced failures of these strips. I wouldn't be surprised if the R uses the same system, so you may have that same problem.
I owned 3 GS bikes before buying an R, and got into the habit of resetting the trip meter at each fill-up, just in case the fuel strip failed (it never did). Since I know about how far the bike can go on a tankful, the trip meter can be used as a backup if the fuel gauge fails.
This is a common issue, mine was bad from the factory. My dealer was able to fix it in less than half a day and I was on my way. They even offered sending a flatbed to pickup and deliver for the service for free. I declined for the offer to put on some break in miles. So are you saying 42k miles? What year is your bike?
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