Crankin- Nothing wrong with doing 6 mph! I'm lucky to see that on dry land, and never on the treadmill. I'd launch myself off the back in a blaze of glory! I keep telling myself that it doesn't matter how fast or how far I go, as long as I'm doing it and without re-injuring myself. (Gosh, it's hard to be that patient!)

If you like running outside when it's chilly and have the clothing to do it comfortably, then why not? It doesn't hurt to mix things up a little, even if cycling is the main sport.