I managed to get 43mpg (UK) yesterday doing entirely motorway stuff for just over 200 miles, there were some annoying 40mph sections and the rest was 70-80mph...best yet for me. Worst has been a smidgen over 26mpg where there is no consistent speed and lots of gearbox work.
My current average for just under 5K miles is 0.18p / mile
I use Fuelly (
http://www.fuelly.com/motorcycle/triumph/rocket_iii_roadster/2013/kaivalagi/223041) to track my fill ups, worth a look! There's also an Android app too...