Welcome to the wonderful world of the BMW fuel guage!
The good news is they have at least reverted back to a float design after the disaster of the digital strip on the later 1200 Hexheads.
Best advice is to run it as low as possible before filling up, this seems to make it more consistent & wises you up on how far you can push it.
Set the trip & work on 200 miles before looking for fuel ... 250 miles can be acheived on the twin cam at a push - I guess the WC is much the same if not better?![]()
On a steady run to the Cotswolds a round trip of 280 miles the gauge was averaging 64 mpg having set it before the ride and all on one tank of fuel.


Maybe I'll try super on the next fill up, and see if I notice any difference

