I tested my new marathon strategy today. Run 4 minutes take a 35 second walk. I am shooting for an 8min pace. This is from Jeff Galloway's run/walk marathon plan. According to Galloway:
"Most runners will record significantly faster times when they take walk breaks because they don't slow down at the end of a long run."
That's good enough for me. The advantage seems to be compounded if the breaks are taken earlier, rather than later.
Welles Park morning run/walk: 2.4 miles total.