Tomorrow is suppose to be pretty nice. Is any one interested in a nice easy cruise, around Plano, maybe cruise down to Dallas? I very recently bought a '98 Valkyrie, and I'm re-learning how much fun it was to have one. I am a little disappointed on how far we can go on a tank, or maybe its just mine, @100 miles on a tank? Is that right? Seems kind of low, but then again, I don't know how far it will go on one.
Spending the afternoon installing and adjusting highway pegs.
Focks
If you're getting 100 miles to either reserve or empty on an Interstate, look for gas running out of holes in the tank.

I'm guessing you don't have an Interstate.
On a Standard/Tourer, 100 miles to reserve is a little low, MPG wise. 100 miles to empty is pretty bad.
Typical MPG is 32 to 38 MPG. A few get more, many get that or less, but it tends to be extremely variable tank-to-tank. However, consistently less than 20 MPG (as your post indicates) means some kind of issue or bad riding conditions (headwind.)
I suggest collecting several tanks of MPG data.