Originally Posted by RickMopar
If you read the owners manual ECO stands for Economy. Which tells you the engine had gone into Multi Displacement from 8 cylinders to four.
Yup its like a game try and keep it at 20 mpg for me anyway.
Not exactly true, it means you are driving in a fuel effiecient manner and/or in mds mode. There are times when the Eco will be displayed and running on all 8.