'07 RK with the V&H tru duals. I get 39-43mpg usually riding one up mix of highway, rural roads, and stop & go traffic. I have just over 3k on it now and hope that the mileage will get better as the miles go up.
I have an 09 and have been religiously recording the mpg so far. Up to this point I have put gas in it 26 times and the least mpg I have ever gotten is 40. I typically ride the highway doing 70 or so. The best mpg was down a mine shaft. By the way, that was the only time I came remotely close to the Harley advertised 54 mpg.