I just did some computations…
If the 1st Mizuno was 15 km, at my pace of 5:26 min/km, I would have finished in 1:21:30.
If this Mizuno Run was 15 km, my pace of 5:11 min/km would have given me a finishing time of 1:17:45. That would have been a 3 min, 15 second improvement!
Just toying around with the numbers 😀