So I never went to reserve the last time I rode the smallframe. This morning, I checked the gas, looked okay, put it to reserve and planned to get gas on the way to work. Things didn't exactly work as planned. I ran out of gas! Which also means that I can't go 12 miles on reserve (quick math says reserve should give me 13 miles, so this is all close). By my calculations, I'm getting about 50 miles per gallon. At least I know.
Thankfully a friend helped me out, and I now have another gas can.