Your vehicle has this feature if you have the bi-fuel model.
The fuel gage selector button is located on the right side of your instrument panel.
The fuel gage selector button allows you to check the fuel level of the gasoline fuel tank and the CNG fuel tank.
If the switch is pressed while operating on CNG, the fuel gage will show the level of gasoline in the gasoline fuel tank. If the button is pressed while operating on gasoline, the fuel gage will show the level of CNG in the CNG fuel tank.
During the fuel level check, the fuel gage will display the fuel level for about 10 seconds. After this check, the gage will then show the level of the fuel on which the vehicle is currently operating.