| Engine | 4.0L 8-cyl |
| Transmission | Automatic 7-spd |
| Drive | 4-Wheel Drive |
| Fuel Type | Premium Gasoline |
| Vehicle Class | Standard Sport Utility Vehicle 4WD |
| Engine Desc | SIDI |
| Start-Stop | No |
| EPA Vehicle ID | 39810 |
11 MPG combined. That’s atrocious fuel economy. If you’re cross-shopping sensible crossovers with the 2018 Mercedes-Benz G550 4×42, you’ve missed the point. This isn’t about frugality; it’s a monument to excess, a rolling celebration of off-road dominance draped in opulent leather. For those who genuinely need to traverse hostile terrain in ultimate comfort, or simply want to make an unparalleled statement, efficiency is a secondary consideration.
City and highway performance
The EPA estimates the G550 4×42 achieves 11 MPG in the city and 11 MPG on the highway. Yes, they are identical. This isn’t some minor discrepancy stemming from testing irregularities; it’s a stark illustration of the vehicle’s aerodynamic profile. Powered by a 4.0L twin-turbocharged V8 engine producing substantial horsepower paired with a 7-speed automatic transmission, the G550 prioritizes brute force over efficiency.
While the engine delivers prodigious torque and acceleration, it demands a constant supply of premium fuel to maintain its appetite. The immense tires and portal axles, vital for its extreme off-road capability, contribute significant rolling resistance, further hindering fuel economy in both city and highway driving.
Annual fuel cost
The EPA estimates the annual fuel cost for the 2018 Mercedes-Benz G550 4×42 at $5,250. This figure is based on driving 15,000 miles per year and assumes current national average fuel prices for premium gasoline. Individual spending will vary depending on driving habits and local fuel costs, but this number indicates the financial commitment associated with owning and operating such a thirsty vehicle.
If you are concerned about a $5,250 fuel bill, consider all Mercedes Benz fuel economy data.
Real-world expectations
While the EPA provides a standardized estimate, real-world fuel economy can deviate. With the G550 4×42, expect the discrepancy to be significant. Aggressive acceleration, frequent off-road excursions, and even strong headwinds can all conspire to reduce fuel economy below the already low EPA figures. Owners who primarily use their G550 for short city trips or off-road adventures may see even lower MPG returns. It’s to factor in these potential variations when budgeting for ownership costs. See the G550 MPG across all years.
How it compares
Compared to other luxury SUVs, the G550 4×42 sits at the extreme end of the fuel consumption spectrum. A more conventional SUV like the Mercedes-Benz GLS 450 achieves around 20 MPG combined, while even high-performance SUVs like the BMW X5 M still manage closer to 16 MPG. Land Rover’s Range Rover, a vehicle with a similar blend of luxury and off-road prowess, achieves around 18 MPG with its supercharged V6 engine. The Lamborghini Urus, despite its incredible performance, manages around 14 MPG.
These comparisons highlight the G550 4×42‘s status as an outlier, a vehicle that prioritizes capability and presence over efficiency. Buyers in this segment are willing to trade fuel economy for the unmatched off-road ability and imposing image that the G550 4×42 delivers.
Tips to maximize efficiency
Expecting miracles is unrealistic, but a few strategies can potentially eke out slightly better fuel economy from your G550 4×42. Avoid aggressive acceleration and maintain a steady cruising speed whenever possible. The twin-turbo V8 responds readily to throttle inputs, but frequent bursts of speed will quickly deplete the fuel tank.
Ensure that your tires are properly inflated. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Use the tire pressure specified on the door jamb sticker as your guide, and check your tire pressure regularly, especially before long trips.
Minimize unnecessary weight. Carrying heavy cargo, such as spare tires, tools, or other equipment, will increase fuel consumption. Remove any items you don’t need to lighten the load and improve efficiency marginally.
Consider the route you take. Whenever possible, choose routes with minimal stop-and-go traffic and fewer hills. Constant acceleration and braking put a strain on the engine and reduce fuel economy. Planning your route ahead of time can help you avoid congested areas and optimize your MPG.