Edit: Getting close. I’ve decided to see if I can crack 200 miles on a tankfull. Watch this space.
OK folks, here's the update. I rolled the old girl out of the garage at home with 191 miles showing on the last tankfull - see pic below.
At the point where I'd just breached the 200 mark I was close to a fuel station and I'll admit it, I bottled it (to use a Brit colloquialism) and pulled in to fill up - see pic 2
Now this is where it gets interesting. On my UK-spec bike the fuel tank size is given as 12.5l yet all I could squeeze in after brimming it was 10.7l, so, theoretically another 1.8l had been left in the tank at 200 miles or, by my reckoning at least another 20 miles.
I don't think I'll run it to 220 any time soon, but it's good to know a 200 mile tank range seems a perfectly feasible working assumption!
EDIT: OK, I know I said I wouldn't, but I'm approaching the end of this tankful so I'm going for 220! Any bets on it out there?