16 MPG combined. Nobody buying a 2022 Mercedes-Benz G550 is prioritizing fuel efficiency. They’re buying a statement, a legend, a military-derived icon dripping in luxury. Fuel economy is simply a cost of entry, an accepted (and often ignored) side effect of commanding the road in a vehicle that’s about as aerodynamic as a brick wall.

City and highway performance

The G550’s 4.0L twin-turbo V8, while potent, is not inherently efficient. Its 14 MPG city rating reflects the realities of hauling over 5,700 pounds through stop-and-go traffic. Expect frequent trips to the gas station. The 17 MPG highway figure is slightly more palatable and achievable if you can resist the urge to fully exploit the engine’s power on the open road. The 9-speed automatic transmission helps keep the engine in its most efficient range at cruising speeds, but even then, the G-Wagen’s sheer mass and upright design constantly fight against aerodynamic realities.

Annual fuel cost

The EPA estimates an annual fuel cost of $3,600 for the 2022 Mercedes-Benz G550. This figure is based on driving 15,000 miles per year, with a roughly 55/45 split between city and highway driving, and using national average fuel prices. For G550 owners, this figure likely represents a small fraction of the overall cost of ownership, which includes a steep purchase price, expensive maintenance, and high insurance premiums.

Real-world expectations

While the EPA provides a standardized benchmark, real-world fuel economy for the G550 can vary significantly based on driving habits and conditions. Aggressive acceleration, frequent off-roading, and extended idling will all negatively impact fuel consumption. Even seemingly minor factors like tire pressure and cargo weight can play a role. For most G550 owners, achieving the EPA estimates will require conscious effort and a restrained driving style a style that arguably defeats the purpose of owning such a powerfully capable vehicle. See G550 MPG across all years to look at data from previous models.

How it compares

Compared to other large luxury SUVs, the G550’s fuel economy is notably poor. The Land Rover Range Rover, in its standard wheelbase V8 configuration, manages around 18 MPG combined. The BMW X7 M50i, with its turbocharged V8, delivers a similar figure. Even the Cadillac Escalade, a significantly larger vehicle, can achieve 17 MPG combined in its 6.2L V8 guise. The hybrid versions of these SUVs offer even more substantial improvements in fuel efficiency. However, these alternatives lack the G-Wagen’s unique blend of off-road prowess, iconic design, and undeniable presence. Customers of all Mercedes Benz fuel economy data often know this tradeoff, and accept it.

Tips to maximize efficiency

While maximizing fuel economy might not be a G550 owner’s top priority, there are a few steps you can take to minimize fuel consumption. Avoid aggressive acceleration and hard braking, and maintain a steady speed whenever possible. The G550’s instant torque delivery can easily tempt you into bursts of speed, but resisting that urge will pay dividends at the pump.

Ensure your tires are properly inflated. Underinflated tires increase rolling resistance, which forces the engine to work harder and burn more fuel. Check your tire pressure regularly and inflate them to the recommended PSI, which can be found on the driver’s side doorjamb or in the owner’s manual.

Reduce unnecessary weight. Remove any items from the vehicle that you don’t need on a regular basis, especially heavy objects. The G550 is already a heavy vehicle, so every pound counts.

Consider using the G550’s Eco drive mode (if equipped). This mode typically adjusts throttle response and transmission shift points to prioritize fuel efficiency over performance. The difference might be subtle, but it can add up over time.