I got at least 55mpg once when my Mulitstrada's fuel gauge packed up and I rode at 50mph for 75 miles because I was worried about running out of fuel in France on a Sunday, when lots of filling stations close. Not fun!
63mph... That looks like an S&S engine. It should be good for 120 lb/ft of torque at about 2500 revs... What the hell have the frogs done to it, filled the sump with foie gras?