Honda’s Eco Assist™ is a simple tool to help you develop efficient driving habits. Coaching bars on either side of the speedometer change from blue to green, depending on how efficiently you're driving. The more they stay green, the better your mpg will be.
 27 city/38 highway/31 combined miles per gallon (gasoline-gallon equivalent) rating. Based on 2014 EPA mileage ratings. Use for comparison purposes only. Your mileage will vary depending on how you drive and maintain your vehicle.
Just push the big green button. In ECON mode, the Civic’s engine and other energy-consuming systems are automatically configured to operate more efficiently. Need more zip? Push it again to return to regular mode.