Glad to see the knee rehab is continuing. I really hope you can make it back into serious enough training to have a good go at that 15K. Competing at the very top of your age group is tough.
I rode 35 miles yesterday with a stiff headwind on a completely open, unprotected road on the way out. I had a nice tailwind coming back but on a more sheltered road, and only managed to average a little better than 15 mph. That's OK, as my legs were still pretty tired from the previous day's hard half-marathon.
I still want another shot at the marathon. The obvious place is my other "local" marathon the first week of November. But in the hope of trying again sooner, I have entered SF at the end of July. If previous results are any predictor of the future there's less than a 50-50 chance I actually make it to the starting line. Each of the past four years my heel has been too sore to run much by the end of July, but I can always hope for better luck this year.
In the meantime, I hope to be chasing that 24-minute 5K over the next month. The race time predictor calculators say a 1:46 half-marathoner should be able to run 5K in about 23 minutes, but I've always been awfully slow at 5K compared to longer distances. We shall see.