The most fuel-efficient Mitsubishi Mirage is the 2014 Mitsubishi Mirage DE which gets 37 MPG City and 44 MPG Highway.
It is important to remember factors such as driving style, weather conditions, and the use of features such as Eco mode can impact fuel efficiency. Fuel economy figures are based on EPA estimates for when vehicle sold as new. Fuel economy may vary for reasons like driving conditions and vehicle history. Unless specified, figures are for vehicles equipped with an automatic transmission. See fueleconomy.gov.