I have had my deuce for going on four years. About two seasons ago I had my bike "tuned" by "the guy" at Woodstock Harley. It had awesome power, but occasional backfire and sub 30mpg. I went back a few times and asked wtf? Was told "that's how it is with that exhaust" the exhaust is a D and D 504 2-1 fat cat. I had almost stopped riding as it was using more fuel than my car.
This pre-season I did my 30k service, and to finish it off, I went back to the same dealer, $400 later on the dyno, more power and more torque, noticeably better response on the throttle.
I got rid of the family and responsibilities this past weekend, went out on a day ride, found gas mileage at 41mpg around town and 43mpg on the highway. Now that once again is the bike for me and forever.