Anyone buying a 2022 Mercedes-Benz AMG GLS63 4Matic Plus should expect around 15 MPG combined. To be clear, buyers of seven-seat luxury SUVs that can accelerate from 0-60 mph in under 4 seconds aren’t usually prioritizing excellent fuel economy. This vehicle prioritizes effortless power and a commanding presence, and its fuel consumption reflects this.

City and highway performance

The EPA estimates the AMG GLS63 gets 14 MPG in the city and 18 MPG on the highway. These figures highlight the engine’s significant fuel consumption in stop-and-go driving. The 4.0L V8, with its twin turbos nestled within the vee, needs a lot of fuel to deliver its impressive performance. While 18 MPG on the highway is possible with a light foot, expect that number to decrease quickly if you use the engine’s power. The 9-speed automatic transmission tries to keep the engine in its most efficient range, but physics ultimately determines fuel consumption.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2022 Mercedes-Benz AMG GLS63 at $3,850. This is based on driving 15,000 miles per year and using national average fuel prices for premium unleaded gasoline, which this performance SUV requires. Consider this a baseline, as aggressive driving or frequent short trips can easily increase this number. Understanding this financial commitment is important for anyone considering this AMG model.

Real-world expectations

While the EPA provides a standardized estimate, real-world MPG often varies based on driving habits, traffic, and terrain. Owners who frequently use the AMG GLS63’s performance will likely see fuel economy below the EPA estimates. Similarly, those who primarily drive in congested cities can expect numbers closer to the 14 MPG city rating, or even slightly lower. The vehicle’s weight and the engine’s demand for fuel when accelerating are key reasons for this.

How it compares

Competitors such as the BMW X7 M50i achieve around 18 MPG combined, while the Audi RS Q8 manages a similar 15 MPG combined. Even the less powerful, non-AMG GLS models often achieve only slightly better fuel economy, like the GLS 450’s 20 MPG combined. The Land Rover Range Rover, another luxury SUV, gets around 18 MPG combined with its more powerful engine options. The slightly better MPG of some alternatives isn’t usually enough to sway buyers in this segment, who prioritize performance and brand recognition, where the AMG GLS63 excels, over small fuel savings. Comparison shopping is always wise, consider browsing AMG MPG across all years.

Tips to maximize efficiency

Gentle acceleration is critical. The AMG GLS63’s immense power is readily available, so avoid constantly using it. Smooth, gradual acceleration will significantly reduce fuel consumption, especially in city driving.

Use the vehicle’s driving modes. Selecting “Comfort” or “Eco” mode will adjust the engine and transmission to prioritize fuel efficiency over performance. This won’t make the GLS63 a fuel-efficient vehicle, but it can make a noticeable difference in everyday driving.

Maintain optimal tire pressure. Underinflated tires increase rolling resistance, making the engine work harder and use more fuel. Regularly check and maintain the recommended tire pressure to improve efficiency.

Minimize idling. Avoid unnecessary idling, especially when the engine is cold. Modern engines warm up quickly while driving, and prolonged idling wastes fuel.

Consider limiting short trips. Cold starts use a lot of fuel. Combining errands into a single trip allows the engine to reach its optimal operating temperature, improving fuel economy. Consider comparing other Mercedes-Benz models, and view the all Mercedes Benz fuel economy data.