Wow, Michael Breeding is proud to be getting just over 40mpg.
And that's with all of the advantages I could give him. So it must have been worse before.
Gas mileage can be confused by many things, not the least of which are inaccurate odometers! And we are also trying to compare apples to oranges with different "gallons" and fuel formulations around the world.
Ethanol'd fuels will certainly not give the mileage of straight petrol, and U.S. quikie-mart P4gas may be the cheapest, but definitely not 'quality'.
And windshields, saddlebags, and payload all take a toll on consumption. And not all of us live in the flatlands either. Nor have a bike as light as Manitou!
I'd be delighted with anything over a solid 35mpg on my 650 lb. rat panhead, without filling my tires 'til they were hard as rocks, like the old tire compounds used to be. Yet it was advertised when new to get much more.
I have yet to get my Chief off of the bench, and my testrides for customers are nothing to get a guestimate from.