Heads up, I normally do mroogle this but didn't want to spend that much time. The reason why I ask is because there are no shortcuts to these items. And since I don't use these items very often, it always takes me a bit to activate/deactivate them. Q1: If I leave USB tethering on, but don't have my iphone plugged in to the mac, does it drain battery life? Q2: Same question also goes for wi-fi. Does the wi-fi keep searching and drain battery life? Thanks all!