Incorrect Distance Information on Stream

It's possible that mounts travel differently in different terrain. That nodes would have few direct obstacles, and your mounts wouldn't need to take the long way around in certain places. Maybe in a node you're using a mount suited to the terrain of the region, but to cross the continent you'd have to travel through areas your mount wasn't specialized to. There are so many things that can affect these general estimates , that I think the level of inconsistency you described is not meaningful to consider.

We just haven't been given exact data, nor do I think anyone intended to do so. We were given perspective , and that, I believe, was done largely successfully. What you've described is within the realm of "future changes due to tuning". Take it as being given the intent, not exact final values that even the devs couldn't currently know.