Pace run - 12.89 km.

Brian and I did a pace run -- 1 mile easy, 6 miles at race-pace or better, 1 mile of cool down. It was a warm day -- particularly for October (24 C.) -- so it was not an easy run. Here are the kilometer splits:

5:46
5:15 pace (600 m.)
4:45
4:48
4:45
4:43
4:41
4:45
4:47
4:46
4:46
4:44 pace (659 m.)
5:39
5:31 pace (626 m.)

So, considering that my race pace is 4:52, I was pretty happy with the splits during the fast part, which ended up at 4:45 as an average.