I get easy 50+ and the wife gets a little better with hers, mine is stock with a K&N filter and hers has a 95 inch motor and a K&N filter. As long as we are in high elevation this is the case if we run low elevation the milage goes down a bit. Also have to run in the 55 to 60 range. Run 70 to 75 and the milage falls off 10% easy. Also clean your filter, makes a big difference.

 

i have a 2008 Road Glide, ultra tour pack, lower fairings, Screaming Eagle compact heavy breathe, Screaming Eagle performance touring mufflers, Screaming Eagle pro race tuner. just did a 2000 mile road trip and averaged 48 - 50 mpg at posted highway speeds 65 - 70 mph. i get about 45 mpg local riding which is a combination of highway and local roads.