Katluvr, you sound exactly like me. My feel good pace is around 11:30, but I got to a 10 min. mile last summer, before my hip started hurting. Now I am back where I was. I also know I can ride 60-75 miles with little training. It will be slowly, but I can do it. I can do almost any hill, too, if I don't care about time. Well, there's been 2 20% grades that got me, but, hey, most people do nothing. Riding with really fast people just depresses me, because I am so not there. I'm not "slow, slow" but not fast enough for the 16 mph average group, either. Plus, my experience with riding has lead me to believe that if I train for running in a really serious way, the fun will go out of it and I will get burned out and stop. I need a happy medium.
I don't train; knowing my compulsive exercise habit, I am pretty sure I would get injured. I spent a few years getting faster on the bike and now age and injury has slowed me down a bit. I do want to get my running speed up, and will work on that over the winter, but once spring comes, I have to train for our bike tour that is in mid May.