2018 Mercedes-Benz AMG GLE63 5.5L: Fuel Economy Analysis

15 MPG combined isn’t just a number, it’s a declaration. It’s the sound of a roaring 5.5L twin-turbo V8 being unleashed, a counterpoint to the practical, family-oriented facade of the Mercedes-Benz GLE. This isn’t a vehicle bought by those prioritizing fuel efficiency. It’s a statement, a calculated trade-off made by those who demand performance above all else and are willing to pay the price at the pump. This AMG variant caters to a specific clientele who want a versatile SUV with supercar-like acceleration.

City and highway performance

The 2018 AMG GLE63 with the 5.5L V8 manages 14 MPG in the city and 18 MPG on the highway. These figures, while seemingly disconnected from modern fuel-sipping trends, are a direct reflection of the engine’s output and the vehicle’s considerable weight. The city MPG reveals the inherent inefficiency of stop-and-go traffic, where the engine is constantly working to overcome inertia. The slightly improved highway MPG suggests that the vehicle can achieve some level of cruising efficiency when maintaining a steady speed, yet pushing the engine to pass even on the highway significantly impacts the MPG. The highway number is merely a suggestion, not a guarantee, depending on how enthusiastically the go-pedal is used.

Annual fuel cost

According to EPA estimates, the annual fuel cost for the 2018 Mercedes-Benz AMG GLE63 5.5L comes out to exactly $3,850. This figure is based on driving 15,000 miles per year, with a specific percentage of those miles driven in both city and highway conditions. The calculation also assumes a national average fuel price, which fluctuates depending on location and time of year. This fuel cost is a significant expense, placing this vehicle squarely in the realm of luxury ownership, where performance and exclusivity outweigh concerns about running costs.

Real-world expectations

The EPA estimates provide a baseline, but real-world MPG will vary depending on several factors. Aggressive driving, frequent short trips, where the engine doesn’t reach optimal operating temperature, and even tire pressure can contribute to lower fuel economy. Owners who frequently exploit the engine’s immense power should brace themselves for numbers below the official ratings. However, those who adopt a more moderate driving style might see figures closer to the EPA estimates, but only if a very disciplined driving approach is employed. Don’t expect miracles; this is an AMG, after all.

How it compares

Compared to its peers, the AMG GLE63’s fuel economy does not shine. The BMW X5 M, while packing a similar performance punch, achieves a slightly better 16 MPG combined. The Porsche Cayenne Turbo, known for its balance of performance and relative efficiency, also posts 17 MPG combined. Even the Range Rover Sport SVR, despite its equally potent supercharged V8, often lands in the same ballpark. To explore all Mercedes Benz fuel economy data, including models with significantly better MPG, makes clear just how much of a compromise the GLE63 is in this area. This data emphasizes the choice the AMG GLE63 buyer makes: a performance-tuned SUV that prioritizes raw power over efficiency. If MPG really matters, perhaps comparing AMG MPG across all years reveals a better balance can be found.

Tips to maximize efficiency

Even in a performance SUV like the AMG GLE63, some strategies can help improve fuel economy, though these strategies are often at odds with the vehicle’s intended purpose.

Resist the temptation to constantly exploit the engine’s power. Each hard acceleration burns through fuel at an alarming rate. Gentle acceleration and anticipating traffic conditions can make a difference, albeit a small one.

Ensure your tires are properly inflated. Underinflated tires increase rolling resistance, forcing the engine to work harder. Check your tire pressure regularly and maintain the recommended levels found on the door jamb sticker.

Avoid unnecessary idling. If you’re stopped for more than a minute, turn off the engine. Modern engines are designed to restart quickly and efficiently, and idling for extended periods wastes fuel.

Use cruise control on the highway whenever possible. Maintaining a steady speed minimizes unnecessary acceleration and deceleration, leading to improved fuel economy. However, be prepared for the cruise control to downshift aggressively on even modest inclines, a characteristic of powerful engines with relatively short gearing.

Remember to remove any unnecessary weight from the vehicle. Excess cargo adds to the vehicle’s overall load, increasing fuel consumption. Cleaning out the trunk and rear seats can contribute to marginal improvements.