The Mercedes-Benz G-Class (G Wagon) is known for its powerful performance but relatively high fuel consumption. For recent models like the 2021 AMG G63, EPA estimates indicate 14 MPG combined (13 MPG city and 16 MPG highway) when using premium gasoline[2].
Real-world driving reports suggest that fuel economy can vary. Easy highway driving on the 2021 AMG G63 can yield approximately 17 MPG, and up to 20 MPG is possible with particularly conservative eco-driving techniques[1].
The newer 2025 G-Class with a six-cylinder engine is rated at 17 MPG city and 19 MPG highway by the EPA, though this is for a different engine variant than the popular AMG models[3].
Older and less powerful models such as the 230 GE average around 17 MPG but offer less performance[4].