Most days, this time of year anyway, I average anywhere from 11-14 mph overall for the day (I usually ride home for lunch) depending on weather/wind. I have averaged as much as 17 mph when pushing it (there some decent hills, no matter which route I choose), but I don't do that too often. I'm in this mainly for the fun of it, and when I'm pushing myself hard I don't pay much attention to the world around me, and that's when it stops being fun. So I usually just pedal at a medium pace and enjoy the ride.