Lately I've been pushing it a bit to see how far the range really goes, and the closest I've come to running dry was 4.42 gallons. The capacity is 4.5!
The odometer read 156 miles, which is only 10 over where I usually fill up. Maybe I was riding a little harder or there was a headwind—who knows.
All I can say is that I'm definitely getting gas before I hit 150 miles from now on...pushing a bike sucks!