I am wondering if there is a way to tell when the MDS kicks in. I have a 2009 Ram Laramie and it has a Fuel saver light that comes on when you are light on the throttle but was told that has nothing to do with the MDS. The Fuel Saver light comes on even when its cold and i was told the MDS only comes on when the truck is up to operating temp. So i believe the fact that that light just means you are driving efficiently but not linked to the MDS. So my big question is how do i know if my MDS works or not?