The 50k training schedule called for 8 miles. I felt pretty good, so I did 10 and mixed in some tempo miles. I started with a 2 mile warmup at about 8:30 - 9:00. Then, I did 4 miles at what I thought would be tempo pace. I managed to stay at tempo for the first mile, then I inexplicably sped up. I was going to do 5 tempo if I felt like it at the end, but 4 burned me out pretty good.
It was a great, if cold, start to the day.