In some areas, before you can use ecoRoute™ features, you must purchase an unlock code or an ecoRoute HD accessory. Go to www.garmin.com/ecoroute for more information.
The ecoRoute feature calculates the fuel economy and the fuel price of navigating to a destination, and offers tools for improving fuel efficiency.
The data provided by the ecoRoute feature is an estimate only. The data is not actually read from the vehicle, unless you are using the ecoRoute HD accessory.
To receive more-accurate fuel reports for your specific vehicle and driving habits, calibrate the fuel economy (Calibrating the Fuel Economy).