Running race 20:02 [5] 4.0 km (5:01 / km)
shoes: New Balance MT572
This was one continuous run but I separated out the first 4k (actually run at race pace, I guess I'm too pessimistic) so that I have the calculator for quick comparison.
I may have maintained the pace after 4k but the trail took me under canopy and the GPSr went goofy.