Well, one day I averaged 23mph, but that was when I was doing a comparison driving the company pickup truck. When I'm riding my bike, my speed is between 14 and 18 mph. There are many uncontrolled variables, such as traffic lights, traffic, and wind. The distance is only 4.5 miles. There are several stretches where I'm able to ride the speed limit and keep up with traffic if the wind isn't against me.