running (trails) 48:27  6.26 km (7:45 / km) +123m 7:03 / km
shoes: GoLite Blaze Lite
Well, that answers that. But not yet a definitive answer.
Somehow AP got this one right as running, even though I punched a bunch of splits. I might have thought that it would have guessed orienteering, so maybe I was going just enough faster? Seems a little unlikely.
Significantly faster than last time, on foot in late afternoon rather than riding in the dark, and I also had familiarity on my side. I think there's potential to speed up the riding significantly, but I ought to be able to run faster as well. Having previously seen it just by headlamp, it was generally familiar for the first half and the last part, a little less so in the middle. Having the setting sun as a reference gave me a different perspective, and being on foot made it feel more like a steady climb with switchbacks. The bike has the advantage of being able to go downhill faster (which will work better in daylight when I can see what's ahead), and running has the advantages of not needing to worry about rough spots, never needing to stop for an obstacle. There was a rough, rocky, rooty section that was difficult on the bike, that I didn't even notice when running. And I never needed to be careful about whether my handlebars would fit between trees.
Splits are at trail junctions that will need to be explored at some point.