14 MPG combined. If that number causes you even a moment’s pause, the 2023 Mercedes-Benz G550 is not the vehicle for you. This isn’t about conserving fuel, it’s about commanding respect, conquering terrain, and making a statement. This is a vehicle bought by those who prioritize presence and capability over pump prices. The thirsty 4.0L V8 is simply part of the G550’s unapologetic persona.

City and highway performance

The EPA estimates the G550 at 13 MPG in the city and 16 MPG on the highway. These figures reflect the realities of its boxy aerodynamics, significant weight, and full-time four-wheel-drive system. The city MPG is particularly revealing. Stop-and-go traffic highlights the engine’s need to constantly overcome inertia, while the highway figure suggests that even steady-state cruising can’t fully mitigate the aerodynamic challenges. The nine-speed automatic transmission works hard to optimize fuel economy, but even its efforts can only go so far against the G550’s inherent design. This is a vehicle far more at home ascending a mountain than navigating a parking garage.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2023 Mercedes-Benz G550 at precisely $4,150. This calculation is based on driving 15,000 miles per year, with 55% of those miles driven in the city and 45% on the highway, using national average fuel prices. It’s a large sum, and one that reflects the G550’s thirst for premium gasoline. For context, this figure is more than double the annual fuel cost of many modern SUVs. Owners should be prepared to budget accordingly, recognizing that fuel costs are a significant part of the G550 ownership experience.

Real-world expectations

While the EPA estimates provide a benchmark, real-world MPG for the G550 can vary significantly based on driving style, terrain, and load. Aggressive acceleration, frequent off-roading, and carrying heavy loads will all negatively impact fuel economy. A gentle driving style and predominantly highway use might yield figures closer to the EPA estimates, or perhaps even slightly higher. However, expecting to consistently exceed the EPA highway rating is unrealistic given the vehicle’s design. Checking G550 MPG across all years can provide an idea of the general performance of the model, and even a well-maintained G550 won’t deliver economy comparable to other SUVs.

How it compares

Compared to other luxury SUVs, the G550 is a clear outlier in terms of fuel efficiency. For example, the BMW X7 xDrive40i achieves 21 MPG combined, while the Land Rover Range Rover P400 manages 20 MPG combined. Even the Cadillac Escalade, with its large V8 engine, achieves around 16 MPG combined, still substantially better than the G550. These vehicles prioritize on-road comfort and efficiency to a greater degree. The G550 offers a specific blend of ruggedness, off-road capability, and iconic design that its competitors simply can’t match. The existence of more economical, and arguably more sensible, SUVs on the market is irrelevant to the G550 buyer. They seek a different experience, and are willing to pay the price at the pump. For complete information, including fuel performance for other models, see all Mercedes Benz fuel economy data.

Tips to maximize efficiency

While the G550 will never be mistaken for a fuel-sipper, there are steps owners can take to minimize consumption. Avoiding aggressive acceleration and maintaining a steady cruising speed can make a noticeable difference, especially on the highway. The G550’s weight and aerodynamics mean that rapid acceleration and hard braking consume extra fuel.

Ensure that the tires are properly inflated. Underinflated tires increase rolling resistance, which in turn reduces fuel economy. Check the tire pressure regularly and inflate them to the recommended pressure listed on the door jamb or owner’s manual. Tire pressure monitoring systems will alert to low pressure, but not necessarily the optimal pressure for the vehicle.

Reduce unnecessary weight. Carrying heavy cargo or equipment in the G550 increases the load on the engine and reduces fuel economy. Remove any items that are not essential for your journey. This is especially relevant for owners who use their G-Wagen for both daily commuting and weekend adventures. Return to a normal configuration after off-road trips.

Consider using the G550’s ECO drive mode, if equipped. This mode optimizes engine and transmission settings for improved fuel economy. While it may slightly reduce responsiveness, it can contribute to a noticeable improvement in MPG, especially during city driving. Ensure regular oil changes are performed with the correct viscosity as indicated in the owner’s manual.