I had the high idel feature activated before I ever took delivery of the truck. And from reading all of the posts on here, I have been fanatical about not idling it unless no other choice, and when I do, it's always with high idle engaged. That and the fact that I'm the only person that drives this thing (except when it's at the delaership) I know for a fact it can't have 21.5 hours of idle on it unless someone at the delaership left it idling over a weekend OR left the key in the on position (engine not running) because the hour meter will still tick over.