i tend to do about 2 or 3 hour rides normally, I'd guess something around 20 miles avg ... avg speed i've no idea ... varies from about 2mph up hills (it's one bitch of a hill) to about 40mph down ... maximum speed i know i ever hit is 45mph and i don't know what a cadence is
i might watch a bit of the tour but i don't find it as exciting as cycling myself ... i prefer off-road though, the road is just to get me from one bit of off-road to the next