Since 14 MPH is about a 4 minute mile you can really fly. The fastest commercial treadmill I've seen tops out at 12MPH. I don't know outside of an exercise physiology department at a major university that would have a treadmill that can go the equivalent of an elite sprinter.
Damn I hadn't realized that a four minute mile is 14MPH. That is awesome. Not that I can do a four minute mile, mind you. I get winded walking from here to the fridge.
I wish I could get my conditioning to a point that I could sustain 10mph for a couple of miles. But then I wouldn't have time for getbig!