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What does the eco light mean on dash of my 2011 dodge ram pick up?

The "ECO" light on the dash of your 2011 Dodge Ram pickup indicates that the vehicle's fuel-saving system is active. This system likely adjusts engine performance (e.g., throttle response, shifting points in an automatic transmission) to optimize fuel economy. When the light is illuminated, it means the truck is running in a mode designed to improve MPG.