Originally Posted by RootBeer
Here's more from the Engineers.
Edit: they added that in order to tell if MDS is on/kicked in the ECO light on the EVIC will show. Therefore, no need for any kind of MDS light.
There have been posts on this that say the ECO light does not always mean the the vehicle is running on 4 cylinders but that you are simply driving in a fuel efficient manner.
So am I to take this as the latest and official word that the ECO light means that the vehicle is only running 4 cylinders when it is on?