Oh, so finally got through a couple of hundred Km of riding.

Still feels rich above 1/2 throttle but fuel economy as follows:
220.2Km, 10.06L
4.58l/100km, 51.35mpg

Not as good as I was expecting, but smaller Mains should help.

What is the best tyre pressure for a bike with 140/70/17 and 110/70/17;