13 MPG combined is what anyone considering a 2015 Mercedes-Benz G550 should expect. That number would stop most modern vehicle purchases, but the G550 isn’t like most vehicles. It’s a large, body-on-frame SUV that can crawl rocks, is covered in leather, and is powered by a loud 5.5L V8. Let’s be honest: its target customer isn’t worried about using less gas.

City and highway performance

The EPA estimates the G550 gets 12 MPG in the city and 15 MPG on the highway. These numbers show the vehicle’s inherent inefficiencies. Its boxy shape creates a lot of aerodynamic drag, especially at higher speeds. The full-time four-wheel-drive system, while needed for off-road ability, adds weight and complexity, which reduces fuel economy. The naturally aspirated 5.5L V8 produces 382 horsepower and 391 lb-ft of torque, but needs a lot of fuel to make that happen. This isn’t a vehicle designed for efficient commuting; it’s built for conquering tough terrain and making a statement, and fuel consumption is simply what it costs.

Annual fuel cost

The Environmental Protection Agency estimates the annual fuel cost for the 2015 Mercedes-Benz G550 at $4,450. This 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. This number can change depending on your driving and local fuel costs. Driving hard, frequent off-road trips, and higher fuel prices will increase your yearly fuel cost. If you are worried about this number, research all Mercedes Benz fuel economy data before buying.

Real-world expectations

The EPA provides an estimate, but real-world MPG for the G550 often doesn’t match the official numbers. Owners often report single-digit fuel economy in city driving, especially in stop-and-go traffic. Highway MPG might reach the EPA’s 15 MPG figure in good conditions, but even slight headwinds or increased speeds can quickly lower that number. The G550’s weight and shape make it very sensitive to driving style and the environment. Some owners may try to drive gently for better fuel economy, but that kind of driving goes against what this vehicle is for.

How it compares

The G550’s fuel economy is poor compared to other luxury SUVs. A 2015 Land Rover Range Rover with its supercharged V6 gets around 19 MPG combined. Even a newer, high-performance SUV like the BMW X5 M gets around 16 MPG combined. The Cadillac Escalade, which is large, delivers around 17 MPG combined in its 2WD configuration. These comparisons show the G550’s unique place in the market. Buyers are often less concerned with MPG and more interested in its design, off-road ability, and presence. If you are in this group, you should also browse G550 MPG across all years.

Tips to maximize efficiency

You can try to get better fuel efficiency in a G550, and here are a few things to consider. Tire pressure matters, so make sure your tires are at the recommended pressure to reduce rolling resistance. This is very important on this heavy SUV.

Gentle acceleration and braking can help save fuel, but don’t expect a big change. Steady speeds on the highway are better than quick acceleration followed by hard braking. Avoid hard driving, as it will use fuel quickly.

Don’t idle more than necessary. The G550’s large engine uses a lot of fuel even when stopped. If you expect to be stopped for more than a minute, turn off the engine to save fuel.

Lower the vehicle’s weight by removing unneeded items from the cargo area. Extra weight makes fuel consumption worse. Think about aftermarket parts too; roof racks or heavy steel bumpers will only make your MPG worse.

Make sure the vehicle is maintained well. Regular oil changes, air filter replacements, and properly working spark plugs can help engine performance and efficiency. Following the manufacturer’s maintenance schedule is always a good idea, especially for the G550.