Run #2 much better than the first one

I did this run at 10:23 a.m., around 4 hours after finishing the first run. This run was much better than expected, the legs were loose and the breathing was unnotable, I felt great, the only problem was the heat and the traffic and noise, etc. It seems that a run after a predawn run goes much looser and faster too. Did the Gomez route that I did past Tuesday, 13 seconds faster. I thought that I was going even faster given the way I felt. I wonder if the predawn runs help afternoon races? I mean would be a good idea to run 15 mins predawn before an afternoon race? Happy Humpday!! Tomorrow morning I hope not to feel stomach issues!