Fastest I've run 3 miles - 19min 12sec. Not much of a distance runner though.
I never really went out for track & field type sports, so I'm not sure what my 100m dash time would be. When I was in the USMC though, I could sprint like a cheetah - but I was never timed. When you're in really, really good shape... load up on creatine. When you sprint, it feels like you're turocharged. It's almost too fast - you feel like you're going to lose control of the sprint. All that extra fuel for the muscles...