Let us know what you get, once you fill up!! I am very interested to see if all that helps or not.
Will probably need a few tanks to get an average, but clicking on my sig will show you my last few tanks.
I remember my TDM900 got 4.10L/100kms (57.4MPG US, 68.9MPG Imp) riding two up most of the time.
Now sure, I know I can't expect that, the TDM wasn't as highly strung, revved lower at speed etc - but 4.5L/100kms (52.27/62.77) would suit me nicely!
I know, I'm dreaming, but I can hope for the best!
Cheers,
Rick