I dunno man, I think you might be faster than this guy on climbs. He struggles on short rises that I can climb in 3 seconds by standing on my 2nd or 3rd highest gear. Also, his stamina is pretty bad in the evenings. That's how I passed him on one evening commute, when he just ran out of gas, and got to see that he had a cassette on the rear wheel, thus ruling out a single-speed/fixie. I hope he doesn't push himself so hard on his sprints that he has a heart attack or a stroke.