Personal Best - Average Speed

I rode in the Cowtown Classic yesterday. Although I only did the 42 mile ride, I did set a personal best record for average on-the-bike speed of 16.2 mph which was quite a jump from my normal average of about 15.6 mph. And I did it even though I was feeling a little cruddy. Imagine what I might be able to do when totally healthy. Boggles the mind, doesn't it?