2016 Mercedes-Benz GL450 Fuel Economy Analysis

19 MPG combined won’t win any hypermiling awards, but it accurately reflects the compromises in owning a 2016 Mercedes-Benz GL450 4matic. This is a substantial, seven-passenger luxury SUV with standard all-wheel drive and a turbocharged six-cylinder engine that delivers performance. Fuel efficiency is less important than space, safety, and the prestige of the Mercedes-Benz star. This isn’t a vehicle bought by penny-pinchers, it’s purchased by families who value those aspects.

City and highway performance

The GL450’s EPA estimates are 17 MPG in the city and 21 MPG on the highway. The city figure shows the realities of stop-and-go driving in a heavy SUV. The 3.0L V6, even with its turbocharger, needs to work harder to get this vehicle moving from a standstill. The highway number is respectable, as the smooth-shifting seven-speed automatic transmission allows the engine to cruise comfortably at lower RPMs.

Expect that highway figure to drop if you’re consistently traveling at higher speeds or carrying a full load of passengers and cargo.

Annual fuel cost

The EPA estimates an annual fuel cost of $3,050 for the 2016 Mercedes-Benz GL450. This calculation is based on driving 15,000 miles per year, with a mix of city and highway driving, and using the national average fuel price for premium gasoline (which the GL450 requires). This figure is just an estimate, and your actual fuel costs will vary depending on your driving habits, local fuel prices, and the percentage of city versus highway miles you drive.

Real-world expectations

The EPA figures provide a useful benchmark, but real-world fuel economy often differs. GL450 owners frequently report slightly lower MPG, especially in areas with heavy traffic or hilly terrain. Aggressive driving habits will reduce fuel efficiency. Consider these EPA estimates as a best-case scenario; you’re more likely to see numbers slightly below them in regular daily use.

Explore GL450 MPG across all years to see how reported efficiency varied in older and newer models.

How it compares

The 2016 GL450 4matic’s fuel economy is in the middle of its competitive set. The BMW X5 xDrive35i offers similar performance and luxury but achieves around 20 MPG combined. The Audi Q7 with its supercharged 3.0L V6 manages roughly 19 MPG combined. A Volvo XC90 T6 is slightly more efficient, delivering around 22 MPG combined. Buyers considering the GL450 are likely cross-shopping these other luxury SUVs, but fuel economy is one factor in the decision. Cargo space, seating comfort, and brand prestige also play important roles.

Also be sure to check all Mercedes Benz fuel economy data.

Tips to maximize efficiency

The GL450’s turbocharged engine responds well to smooth, consistent throttle inputs. Avoid abrupt acceleration or hard braking, as these actions impact fuel consumption. Anticipate traffic flow and maintain a steady speed when possible. The GL450 is heavy, so plan well ahead.

Regular maintenance is critical for fuel economy. Ensure that your tires are properly inflated and that your engine is running smoothly. A well-tuned engine and properly inflated tires reduce rolling resistance and improve overall efficiency. Follow the Mercedes-Benz recommended maintenance schedule for your GL450.

Remove unnecessary weight from your vehicle. Carrying extra cargo in the trunk or roof rack increases the load on the engine, leading to lower fuel economy. Empty out any items you don’t need to carry regularly.

Consider using the GL450’s “ECO” driving mode, if equipped. This mode adjusts throttle response and transmission shift points to prioritize fuel efficiency. While it might slightly reduce performance, it can help you save fuel, especially during city driving.

Minimize idling. If you’re stopped for more than a minute, turn off the engine. Modern engines are designed to restart quickly and efficiently, so you won’t waste more fuel than you save. This simple habit can make a difference over time, especially if you spend a lot of time in stop-and-go traffic.