I average about 16.2 - 16.7 mph solo depending on the wind in a 29 mile ride commute. Its mostly rolling inclines with a small hill at the end that tires me out. First 4 miles of the ride I go at a 13-15mph pace and then for the rest, I'm cruising at 20mph++. At some point of the ride I sustain 30mph for 30 seconds on a nice steady decline.. There's a lot of traffic lights. 3 months ago my avg was like 13mph. I'm definitely getting faster and enjoying it! My goal is to average 20mph and sustain that for an hour at minimum and not be exhausted at the end of the ride.