16 MPG combined is not a typo. The 2021 Mercedes-Benz GLS600 4matic Maybach, with its handcrafted interior, champagne flutes, and thunderous 4.0L twin-turbo V8 engine, is unapologetically inefficient. The buyers for this vehicle aren’t cross-shopping economy cars; they’re seeking the ultimate in opulent transport, and fuel costs are simply a rounding error in their budget.

City and highway performance

Breaking down that combined figure, the GLS600 Maybach achieves 15 MPG in the city and 19 MPG on the highway. The city figure reflects the reality of hauling nearly three tons of meticulously crafted metal and leather through stop-and-go traffic. That potent V8, even with its mild-hybrid assist, needs a steady diet of premium fuel to deliver its effortless acceleration. The 19 MPG highway figure is more palatable, suggesting reasonable efficiency when cruising at a steady speed. However, spirited driving, which this vehicle encourages, will quickly diminish even that modest return.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2021 Mercedes-Benz GLS600 4matic Maybach at $3,600. This figure is based on driving 15,000 miles per year, with 55% of those miles driven in the city and 45% on the highway, using national average fuel prices. It’s a substantial sum, certainly, but a pragmatic buyer considering the GLS600 Maybach understands they are paying for an immensely luxurious experience, and the fuel expense is factored into the equation. To further investigate GLS600 MPG across all years, feel free to browse our other resources.

Real-world expectations

While the EPA figures provide a baseline, real-world fuel economy for the GLS600 Maybach can vary significantly. Driving style, traffic conditions, and even tire pressure can all impact the MPG. Owners who frequently use the vehicle’s considerable power and acceleration should expect numbers closer to the city rating, while those who primarily use it for long highway cruises may see figures slightly above the EPA estimate. However, it’s unlikely anyone is purchasing this vehicle with fuel efficiency as a top priority.

How it compares

Compared to other ultra-luxury SUVs, the GLS600 Maybach’s fuel economy is squarely in line with expectations. The Bentley Bentayga, with its W12 engine, achieves a similar 15 MPG combined. The Rolls-Royce Cullinan, another competitor in this rarefied segment, also posts comparable fuel consumption, and even the BMW Alpina XB7, a slightly more performance-oriented SUV, sees around 17 MPG combined. These figures highlight the trade-off between luxury, power, and efficiency, a trade-off that buyers in this segment are willing to accept. Shoppers who prioritize fuel economy might consider a Mercedes Benz GLE plug-in hybrid, although they would be sacrificing a level of bespoke luxury in the process. Our site is dedicated to informing you about all Mercedes Benz fuel economy data.

Tips to maximize efficiency

Although fuel economy may not be important for GLS600 Maybach owners, there are still steps that can be taken to optimize efficiency without sacrificing the driving experience. Gentle acceleration and anticipation of traffic flow can reduce unnecessary fuel consumption. The 9-speed automatic transmission is designed to keep the engine in its most efficient range, so avoid aggressive throttle inputs that force frequent downshifts.

Ensure that the tires are properly inflated. This reduces rolling resistance and can improve fuel economy by a small but measurable margin. Consult the sticker on the driver’s side doorjamb for the recommended tire pressure.

Avoid unnecessary idling. The GLS600 Maybach features an engine start/stop system that automatically shuts off the engine at stoplights and other brief pauses. Make sure this system is enabled to conserve fuel.

Plan your trips to minimize stop-and-go driving, particularly in urban areas. Consider alternative routes or off-peak travel times to reduce congestion and optimize fuel efficiency. Regular maintenance, including air filter replacement and oil changes, will also help keep the engine running smoothly and efficiently.