Most of you may not be interested in this stuff, but I love looking at such numbers - Haylee may have some interest since she is considering an IM. This was the Louisville analysis of average splits, finish times, etc. The average marathon time jumped up to 5:22. The website itself does the same thing for all Ironman races.
Yes, 2009 was the coolest followed by 2011. The even years have been the harshest for some weird reason. Louisville is all about pacing and nutrition. Get that and you'll finish.