I have to jump in and add to the fuel mileage reports. I don't believe the bikes will get the type of mileage in the States, that you are getting across the pond.
We are using Ethanol in our gas and that will drop the mileage around 10-15%, maybe more. I went from 44mpg to 36mpg on my last bike when I could no longer buy Ethanol free gas.
Just an FYI..