[HoneyBadger]

That may be the case, but it would be circumstantial. You're postulating a certain horse supplied with certain food traveling over certain ground against a certain opponent. I don't disagree with the assessment in theory, but you're talking about a horse PLUS a human VS a human, that throws the experiment off. Animal vs animal is a whole other deal since one of the reasons humans perform so well is by using our brains. We're talking a flat stretch of more or less constant motion. Again, in your experiment, the horse would be stopping and starting at the discretion of it's rider, not motivated by it's own fear. Don't forget also that some humans can travel 50 miles at a stretch, day after day. That's a good run even for a horse. I know horses might be able to go 70 miles or more, but they also tend to take more wear and tear than a human does and tend to recover from injury more slowly if at all.