13 MPG combined. To be blunt, the 2018 Mercedes-Benz G550 4.0L 8-cyl isn’t about saving fuel. This is a body-on-frame, boxy SUV with a strong twin-turbo V8. Fuel efficiency is simply not a major concern for the buyer who chooses the G-Wagen. These owners prioritize presence, prestige, and off-road capability far above the cost of gasoline.

City and highway performance

The EPA estimates the 2018 Mercedes-Benz G550 achieves 13 MPG in the city and 14 MPG on the highway. These figures show the G-Wagen’s inherent inefficiencies. Its brick-like aerodynamics and considerable weight (over 5,700 pounds) require significant energy. The 4.0L V8, while offering substantial power, works hard even in everyday driving, contributing to the low fuel economy. The seven-speed automatic transmission is also a factor; it is less efficient than today’s eight-, nine-, or ten-speed variants. While some might try to hypermile, the G550’s handling simply does not reward trying to drive that way.

Annual fuel cost

According to the EPA, the annual fuel cost for the 2018 Mercedes-Benz G550 is a substantial $4,450. 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. The calculation assumes the G550 requires premium fuel, which is almost certainly the case given the engine’s high specific output. This cost is part of G-Wagen ownership; potential buyers must factor this into their long-term budget.

Real-world expectations

While the EPA provides a standardized rating, real-world fuel economy can vary. Aggressive driving habits, frequent off-roading, and even the specific terrain can all impact how often you’ll be visiting the gas station. Owners who use their G550 primarily for short city trips and rarely venture onto the highway should anticipate fuel economy at or even below the EPA’s 13 MPG city rating. On the other hand, consistent highway driving, within legal speed limits of course, may yield slightly better results, perhaps closer to the 14 MPG highway figure. Realistically, deviations from the EPA numbers will be minimal.

How it compares

Compared to other luxury SUVs, the 2018 G550’s fuel economy is undeniably poor. A 2018 Range Rover with the supercharged V6 manages around 19 MPG combined. Even the larger, more powerful Range Rover with the supercharged V8 achieves 16 MPG combined. The Cadillac Escalade, another large SUV, clocks in around 17 MPG combined. For those seeking all Mercedes Benz fuel economy data, the contrast is stark even within the brand. A more relevant comparison might be with other specialty off-road vehicles like the Jeep Wrangler Rubicon, which achieves around 20 MPG combined with its 2.0L turbo engine. These comparisons highlight the G550’s focus on performance and capability over efficiency. Knowing the G550 MPG across all years is key when comparing with competitors.

Tips to maximize efficiency

While the G550 isn’t known for its fuel efficiency, there are still some ways to minimize fuel consumption. Avoid aggressive acceleration and hard braking. The G550’s weight and powerful engine mean that even minor bursts of speed require a significant amount of fuel. Anticipate traffic and maintain a steady pace whenever possible.

Ensure your tires are properly inflated. Underinflated tires create more rolling resistance, which reduces fuel economy. Check your tire pressure regularly and inflate them to the recommended specifications found on the driver’s side doorjamb. Even a few PSI of difference can impact fuel consumption.

Reduce unnecessary weight. Carrying extra cargo in the G550 adds to its already considerable mass, requiring more energy to move. Remove any items that are not essential for your daily driving. This might seem like a small change, but every little bit helps.

Consider using a lighter touch on the throttle. The G550’s twin-turbo V8 packs a punch, but using its full potential at every opportunity will decimate your fuel economy. Focus on smooth, controlled acceleration and let the engine’s low-end torque do the work.