Quote Originally Posted by trickytiger
the total ridden distance at the end of 45 minutes was reading 4.98 miles according to the odometer... I KNOW that loop is twice as long as the odometer claimed it was!
4.98 miles in 45 minutes would be an average of 6.64mph. 10 miles in 45 minutes would be an average of 13.33mph. Did it actually take you 45 minutes of riding time? Does 13.33 sound more realistic?

If you are sure it is calibrated correctly, it sounds like your computer is not picking up all the miles. Maybe it is stopping and starting. If it is wireless, maybe there is some kind of radio interference (other electronic devices). Are you sure you have everything in miles and not kilometers?

If all else fails, I would recommend that you start all over. Remove the battery and zero out the whole thing. Reinstall the battery and reprogram the computer and see if that helps. My friend's computer (a cateye) was spazzing out on him. The mph would be erratic. It would jump from 13mph to 25mph for no reason at all. Resetting fixed it all.