Videos.

I took some footage - her are just 4 clips from about 12

Each clip has one or two real time passes, followed by a 20% speed slow motion.

Barefoot, steady, about 5:30/km, possibly 5:15/km
https://youtu.be/3KjClrxYitA

Barefoot, about 4:30/km
https://youtu.be/aPQ1gAb_gmk

Vivobarefoot Stealth, about 4:30/km
https://youtu.be/INFuRO_GmGk

Vivobarefoot Stealth, about 3:00/km
https://www.youtube.com/watch?v=hGMycTCefYU