4 short questions about Fatigue

[onomastikon]

1. Does pure movement (advancing, running) cause fatigue?

2. Stats on items that reduce fatigue (like girdle of might, etc.) dont make it clear to me by how much. Is there a way to figure that out? Does it count for all activities (e.g. trampling, casting, melee, etc.)?

3. Speaking of stats, what exactly do these numbers mean when it reads e.g. "30-". They dont seem to cost exactly 30. When my Great Mother casts one of those in her dominion with -3 drain, it should cost her way more -- but her fatigue only seems to go up by less than 30. Is this "-" in the "30-" mean something?

4. What exactly is the deal with fatigue and mounted units?

Thank you.