Riding Sapient Creatures
Riding a willing, non-minion creature costs both rider and mount an action each turn to coordinate, unless it's your own eidolon.
Parent page Steed Form
Riding along on a sapient creature that isn't a minion requires a lot of coordination and timing. Both the riding creature and the mount regain only 2 actions at the start of their turns each round, as both the mount and the riding creature interfere with one another's actions. If you ride your eidolon, you reduce your total actions to 2 and continue to share actions normally—you don't reduce the number of actions twice.
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