Open Dash Settings, then Fuel. Select Gasoline or Diesel, then enter your tank capacity. Each fuel type applies the correct air fuel ratio for the lambda and AFR displays.

Tank capacity is what turns a fuel level percentage into a usable range figure. Enter the real capacity of the tank fitted, not the factory figure, if you have changed to a fuel cell or an auxiliary tank.

1. Press FUEL in the Dash Settings menu.
2. Select the fuel type: Gasoline or Diesel.
3. Enter the fuel capacity of your vehicle.

If you run E85 or a flex fuel setup, set the fuel type that matches your AFR target and take the AFR display from your ECU’s own lambda channel rather than the calculated value.

Related: My Fuel Level Reads Wrong · Vehicle Setup: Name, Weight, Odometer and Top Speed · Units and Values: Metric, Imperial and Display Formats