The Eco light on your car's dashboard is designed to help you save fuel. When the light is on, it means that your car is running more efficiently and using less gas. However, there are times when you may want to turn the Eco light off. For example, if you are driving in a hilly area or in stop-and-go traffic, turning off the Eco light can help improve your car's performance. If you are unsure whether or not to turn the Eco light off, consult your car's owner's manual for more information.