Fuel Saver Indicator
WARNING: This page is about a different car, the 2016 Jeep Wrangler and 2015 Jeep Wrangler. However, it is still accessible from the selected car via links, so may be relevant.
If the vehicle is so equipped, the ECO / ECO-on message will display in the odometer display. The message will appear whenever the vehicle is driven in a fuel efficient manner.