if I dont use it, then I can kill 4-5 things instead of 2 until mage pet is out of power. mage pet is an expert...
There is an AA skill that helps replenish your pet's power. It's used for a self-heal, but it seems to help with power use overall. Another thing you can do is use Sacrifice once in a while. Your mage pet should hold aggro while it's unable to auto-attack for a short while, and the Sacrifice will replenish its power as well as your own.