Ehh...I used to totally stress-out about my crappy "average speed", which on most rides is usually somewhere in the 14's or 15's. But then I realized that all of my riding is done in very traffic-congested areas, with stop signs and/or stoplights every 1/2 mile (or often more frequently), as well as dealing with wind on nearly every ride...so that will definitely bring my average speed down by a lot. I'll check it, every so often on longer rides...but generally I don't concern myself with it anymore. If I remember, I might check it at the end of a ride just to see how I did.