I'm 5' 11" and 170# (though I carry 20#'s of books on my back for 100 miles daily) and feel pretty good, though I sometimes wish I could stretch out a touch. You might benefit from some lower pegs. There are a few aftermarket made for the bike, and I saw on cbr250.net someone put some Buel pegs on for a quarter the price without too much fuss. I'm thinking of doing the same.
Runnin' on empty:
I made it a touch over 38 miles on reserve today, the farthest so far. There seemed to be just a splash left in the tank when I got home. There was even a head wind, so I wonder how far I could take it?