My experience is that enemies tire out eventually, but some can run quite far before it starts to affect them. I've attributed that to a light load. Note that "quite far" may well be sufficient for them to catch up with you, in which case you'll have to chose whether to fight back or continue to try to get away (fighting is definitely tiring).
If there is a thick crust on the snow it's probably faster to run than to ski on it, but running will tire you out eventually, while skiing will not (in these conditions, at least if you're a skilled skier).
Topic: NPCs to use exactly same movement rules as player character. (Read 9725 times)