The 2024 Mercedes-Benz AMG GLS63 4Matic Plus, with its 16 MPG combined, isn’t designed for fuel efficiency. It’s engineered for performance, a seven-seat SUV that accelerates like a sports car. Owners likely value speed and luxury over saving money at the pump. Fuel economy is a consequence, not a reason to avoid this vehicle.

City and highway performance

The 2024 AMG GLS63’s EPA ratings are 14 MPG in the city and 18 MPG on the highway. The city figure shows the engine’s thirst when repeatedly using its power. The highway rating, still low, improves because the engine spends more time at a steady cruise, allowing the 9-speed automatic transmission to operate efficiently.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2024 AMG GLS63 at $3,600. This is based on driving 15,000 miles per year and using national average fuel prices. This is just an estimate. Real-world costs will vary based on driving habits, local fuel prices, and fuel type. This high annual fuel cost probably won’t bother anyone considering the roughly $150,000 MSRP, but it’s good to understand the cost of operating a high-performance machine.

Real-world expectations

Expect that 16 MPG combined to be optimistic in real-world conditions, especially if you regularly use the AMG’s performance. Aggressive acceleration, frequent gear changes, and extended idling will all decrease fuel economy. Drivers who use the AMG GLS63 primarily for urban commutes, or who regularly exploit its capabilities, should expect lower numbers. You might see better numbers during long highway trips if you can resist the urge to use all 603 horsepower.

How it compares

Competitors include the BMW X5 M, rated at 15 MPG combined, and the Porsche Cayenne Turbo S E-Hybrid, which offers a higher combined MPG rating, but requires charging. Audi’s RS Q8 achieves a similar 16 MPG combined. The Range Rover Sport SV offers its own performance and practicality. While these alternatives might offer slightly better fuel economy, the differences are often small, and the decision comes down to brand preference, driving dynamics, and vehicle characteristics.

Tips to maximize efficiency

The AMG GLS63 isn’t efficient, but conscious practices can slightly improve fuel consumption. Smooth acceleration and avoiding abrupt braking reduces fuel consumption. Respect the accelerator pedal, and anticipate traffic to avoid hard stops.

Minimize idling time. Modern engines consume fuel even when stationary, and prolonged idling impacts fuel economy. If you’ll be stopped for more than a minute, turn off the engine where it is safe and legal.

Use the AMG’s drive modes carefully. Select “Comfort” or “Eco” modes when maximum performance isn’t needed. These modes optimize throttle response and transmission mapping for efficiency. “Sport” and “Sport+” modes prioritize performance, which reduces fuel economy.

Ensure proper tire inflation. Under-inflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Check your tire pressures regularly and maintain them at the recommended levels, typically found on a sticker inside the driver’s side doorjamb.

Consider exploring AMG MPG across all years to see how models have evolved. Or perhaps review all Mercedes Benz fuel economy data to appreciate the brand’s broader portfolio.