Elevation profile/Pace chart pretty much tell the story. I also started to dog it a bit as the HR graph reveals in the second half as I knew I didn't have a shot. Average pace was 6:36. I'll need 6:35 for 10 miles to PR at Cherry Blossom. Surprisingly, I'm going to say that's "not crazy." It's a flat course and I'm better at 10 miles than 10k. I find it easier to be sub-threshold and hang on the last few miles than continuously try to keep myself above threshold.