17 MPG combined won’t top any fuel economy charts, but that’s irrelevant to buyers of the 2023 Mercedes-Benz GLS600 4Matic Maybach 4.0L 8-cyl. This vehicle prioritizes unparalleled luxury and effortless power, a quiet space that insulates its occupants. For those who value handcrafted leather, massaging seats, and the strong surge of a twin-turbo V8 more than fuel efficiency, the GLS600 Maybach delivers.

City and highway performance

The EPA estimates the GLS600 Maybach will achieve 15 MPG in the city and 20 MPG on the highway. These figures result from the Maybach’s weight, its powerful 4.0-liter twin-turbocharged V8 engine, and the full-time 4MATIC all-wheel-drive system.

The engine delivers exhilarating acceleration but requires substantial fuel to keep its 550+ horsepower running smoothly through the 9-speed automatic transmission. Stop-and-go city traffic hurts fuel economy, while consistent highway speeds can recover a few MPG, but not enough to call it efficient.

Annual fuel cost

The EPA estimates an annual fuel cost of $3,400 for the 2023 Mercedes-Benz GLS600 Maybach. This is based on driving 15,000 miles per year with a mix of city and highway driving, using the national average fuel price at the time of calculation. Premium fuel is required for optimal performance, adding to the cost. The $3,400 figure shows that this vehicle isn’t about economy, a fact its buyers understand.

Real-world expectations

Real-world MPG will vary based on driving style and conditions. Aggressive acceleration, frequent short trips, and extended idling will negatively impact fuel economy. A relaxed driving style and longer highway journeys could improve the numbers slightly, but don’t expect miracles. Given the vehicle’s weight, engine size, and intended use, hitting the EPA estimates consistently will require effort. Also, the GLS600 MPG across all years is not likely to improve dramatically given the vehicle’s inherent purpose.

How it compares

Compared to other ultra-luxury SUVs, the GLS600 Maybach’s fuel economy is in line with its competitors. The Bentley Bentayga achieves around 14 MPG combined in some configurations, while the Rolls-Royce Cullinan returns around 12 MPG. Even the Range Rover, in its higher-performance trims, struggles to break the 18 MPG barrier. At this price point, fuel efficiency is a minor concern. Buyers care more about exclusivity, craftsmanship, and performance, areas where the Maybach excels. You can examine all Mercedes Benz fuel economy data to consider the fuel-sipping lineup. For the Maybach buyer, however, these other vehicles are of little interest.

Tips to maximize efficiency

While maximizing fuel efficiency isn’t the main goal for GLS600 Maybach owners, some strategies can help minimize fuel consumption. Gentle acceleration and anticipating traffic flow can make a difference, and avoiding unnecessary idling helps too. The smooth operation of the 4.0L V8 rewards a light touch.

Ensure proper tire inflation because underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Check the tire pressure regularly and inflate them to the recommended levels listed on the driver’s side doorjamb.

Avoid carrying unnecessary weight. The heavier the vehicle, the more fuel it consumes. Remove unnecessary items from the trunk or cargo area to reduce the load on the engine.

Consider using the “Comfort” driving mode when appropriate. The “Sport” mode unleashes the engine’s full potential but increases fuel consumption. The “Comfort” mode optimizes the engine and transmission settings for smoother, more economical driving.