I've thoroughly enjoyed my 82 LS for the last season and half that I've ridden it, but I've never gone more than about 130 miles in a day, and usually it's just been tooling around RI. I started riding as a way to get around rather than as a way to go out and just have fun.
Today I took a trip up to Max BMW in New Hampshire. The almost entirely interstate ride of 110 miles each way was more pleasant than I expected, and the bike sang sweetly at around 6K (75-80mph sustained) for most of the trip. A couple spots of grooved pavement and the cold wet weather within 10 miles of the NH border prompted more, uh, legal speeds.
I'm glad the old girl finally got to stretch her legs a bit. I did too by moving my feet to the passenger pegs for a while. Almost makes me want some rearsets. I've gotta say, this bike is quite comfortable, and allows plenty of room to modify your seating position as you ride so that you don't get locked in one position. The only real fatigue I had was in my wrists, but it quickly faded when I got off the bike. I think some smoothing of the throttle action would help... and maybe I should balance my wheels and see if that eases vibration in the bars a bit as well.
Still, I'm happy, I'm not sore, and can't wait to extend my travel radius. Perhaps the Kancamangus Highway is in order soon.