The 2021 Mercedes-Benz AMG GLE63 S 4matic Plus, equipped with its hand-built 4.0L V8, achieves a combined fuel economy of just 16 MPG. Let’s be clear: no one buying this ferocious SUV is prioritizing efficiency. This machine exists to deliver breathtaking performance, opulent luxury, and aggressive styling, and its fuel consumption is a secondary consideration, often an afterthought entirely, for its well-heeled clientele.

City and highway performance

Contributing to that 16 MPG combined figure are EPA estimates of 15 MPG in the city and 19 MPG on the highway. The city number reflects the engine’s prodigious power being deployed in stop-and-go traffic, where the weight of this performance SUV and the need for frequent acceleration take their toll. The highway figure improves, but still reflects the substantial aerodynamic drag of a large SUV, as well as the engine’s readiness to unleash its power at a moment’s notice. These numbers are simply the cost of admission for experiencing this level of performance and presence.

Annual fuel cost

The EPA estimates that the annual fuel cost for the 2021 Mercedes-Benz AMG GLE63 S 4matic Plus will be $3,600. This figure is calculated based on driving 15,000 miles per year, with 55% of those miles driven in the city and 45% on the highway, using the national average fuel price (which fluctuates, but is factored into the EPA’s calculations). For owners of this vehicle, the $3,600 per year for fuel is likely less than the cost of their annual maintenance or a single detailing visit. The true cost of performance is more than just the fuel, and these buyers understand that equation perfectly.

Real-world expectations

While the EPA estimates provide a benchmark, real-world fuel economy for the AMG GLE63 S can vary significantly. Aggressive driving, frequent use of the engine’s prodigious power, and extended periods of idling will all decrease fuel efficiency below the EPA estimates. Conversely, gentle acceleration, consistent highway speeds, and using the vehicle’s various drive modes to optimize fuel consumption *could* yield slightly better results. However, the temptation of the V8’s soundtrack and blistering acceleration is often too strong to resist, meaning most owners will likely see numbers at or slightly below the EPA’s projections. Check AMG MPG across all years.

How it compares

Compared to its competitors, the AMG GLE63 S occupies a predictable position. The BMW X5 M, producing similar horsepower, offers comparable fuel economy, registering around 15 MPG combined. The Porsche Cayenne Turbo S E-Hybrid, with its plug-in hybrid system, *appears* to offer better fuel economy on paper (around 20 MPG combined), but that number is heavily dependent on consistent charging and short trips run solely on electric power. In real-world conditions, especially under spirited driving, the Cayenne’s fuel consumption can easily fall to similar levels as the AMG GLE63 S. A Range Rover Sport SVR, another formidable competitor, mirrors the AMG’s thirst, hovering in the low teens. The buyer considering the GLE63 S isn’t cross-shopping a Prius anyway. The priority is performance and prestige, not pinching pennies at the pump. See all Mercedes Benz fuel economy data.

Tips to maximize efficiency

While outright fuel economy is unlikely to be a primary concern for AMG GLE63 S owners, there are still strategies to marginally improve efficiency.

Use the vehicle’s “Comfort” or “Eco” driving modes when performance isn’t important. These modes adjust throttle response, transmission mapping, and other parameters to prioritize fuel efficiency over outright power. They won’t transform the GLE63 S into a fuel sipper, but they can make a small difference during routine commutes.

Avoid prolonged idling. The 4.0L V8 consumes a surprising amount of fuel when idling, even when the vehicle is not moving. If you anticipate being stopped for more than a minute, consider turning off the engine.

Ensure that your tires are properly inflated. Underinflated tires increase rolling resistance, which reduces fuel efficiency. Check your tire pressure regularly and inflate them to the recommended pressure specified on the doorjamb sticker.

Anticipate traffic flow and avoid aggressive acceleration and braking. Smooth, consistent driving conserves fuel, while abrupt maneuvers burn it unnecessarily. Using the adaptive cruise control on the highway can also help maintain a consistent speed and minimize fuel consumption.