Similar histogram for Joe Fejes' world-class 6day effort last year. These are even roughly KM splits, not miles, and there is still not a single one below 7. Granted RY cannot be expected to have such a great pacing strategy as a noob, but the contrast here is striking.
OK, you had to bring Joe into this.....
First, a little history. Over the last three years, Joe has been the most dominant 6 Day runner in the world.
I crewed Joe for all four of his 6 Day runs, and worked with him on pacing and strategy for the last three.
I was asked how many sub 7 min/mile Joe ran during these competitions. ZERO!
If Joe were to run a lap at sub 9 min/mile, he would get the 'slow down' sign from me. But this would only happen on Day 1 - in the first 50 miles when the legs are still fresh and it's so easy to pick up the pace.
These runs were all done on small looped courses (0.26-1.05 miles) that are flat; closed to traffic; with waterbottle handoffs every lap. In other words, optimal conditions.
Now, running sub 7 min/mile during a transcon, on the open road, after a week?