average speeds are tricky. On a road or unladen cx bike, when I'm feeling frisky but not quite racey my average cruising speed on a commute might be 20mph. But if I have mapmyride running for that ride, my "average speed" is often way down to 13 or less, because of stops. On my beater, where I rarely push it and often cruise down at 15mph, my average is probably 11mph, though I rarely use GPS tracking on those rides