Crossposted from the commuting forum: Thread. Isn't she pretty:
I can cruise at about 16 MPH on the flats, and had it up to 38 MPH earlier today on a long downhill stretch. I expect I'll be able to cruise at 18 MPH as my fitness improves, though the top speed will probably decrease slightly as my weight drops (I'm at about 245 lbs. right now).