What are the reasons for that? The truck is a 4x4 with heavy offroad use in mind and will soon be getting a second transfer case, so it will spend a lot of time idling and at relatively low speed just crawling up, over, and down obstacles. I want to max my economy at those speeds and figured closed loop would be optimal, but I'm really a n00b at this stuff. I just set my Open Loop - RPM threshold to an "idle off" value of 600 rpm and it seems to have done the trick. I'm going to compare a couple of bins to see what they're running.