Question about Tele Mastery

I was wondering if the mana cost of max tele mastery (20) added onto the initial mana cost of teleport? (In a battlemage's case, 22) Or is it just the cost of activating teleport mastery? Also, is the extra travel distance given by tele mastery passive? or do you need to activate the skill to gain the bonus?

I don't think the teleport range increased. I think the distance added is just how much further you can hit monsters when you teleport. Or maybe it's passive and I didn't see before I maxed it.