I bought my 06 TBA in June and I have 999 miles on her. I have a company car and save every gas receipt for expense proposes.
I'm not anal just habit so I have every gas receipt for my bike I added everything up and I have put in 20.94 gallons that equates out to 47.7 miles per gallon.
I live in NW CT so it is all hills, I have somewhere around 200 of the 1000 miles on the highway, but even on the highway around here either you are going up or going down.
My bike is stock (still waiting for my AI kit and related parts from Brents three weeks now). Although I just removed the rear baffles yesterday.