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I average 48 to 52, but have gotten as low as 46, and as high as 55. That is on my 99 carbed EVO with drag pipes and K&N air cleaner. 45 pilot jet, and 180 main. I am a happy camper. The time I got 55 I had a nice 30 mph tail wind for well over a 100 miles.
"02 FXD w/Kur.Hypercharger, mild Crane cam, Crane lifters, removal Windshield and Metzeler ME880. On a round trip from Salem, AL to Springfield, LA varied between 49 to 52 mpg with 30# of gear, I weigh 232#. When FXD was stock got about 39 to 42 mpg on same trip. All these add-ons and mods were with mpg performance in mind. GOOD LUCK!