Reading your log brings back a lot of nostalgia. One of my first runs in Blacksburg with the team was going down that and back up on Harding Rd. When I got into cycling I used to do a very similar route as yours this day, but more often going the other direction and returning via Christiansburg.
Your timing to the second is pretty amazing given different conditions, training cycles, etc... I've done that with some runs, but usually those will still vary a few seconds.