21 MPG combined won’t win any fuel economy awards, but for the 2016 Mercedes-Benz GLE550e 4matic, it’s a compromise many buyers accept. This isn’t a Prius; it’s a luxury plug-in hybrid SUV. The kind of vehicle bought by those who value refinement, performance, and a certain level of green credibility in a prestigious package. Fuel efficiency, while appreciated, isn’t always their top priority.

City and highway performance

The GLE550e’s EPA ratings break down to 20 MPG in the city and 23 MPG on the highway. Considering its heft, standard all-wheel drive, and 3.0-liter V6 paired with an electric motor, these numbers are perhaps better than one might expect. The electric motor provides a boost that can improve city MPG for drivers who are mindful of using electric power in stop-and-go traffic. The highway number, while not spectacular, is adequate for long road trips. The seven-speed automatic transmission is smooth, helping the GLE550e maintain efficiency at cruising speeds. To see how these MPG numbers are affected accross model years, see GLE550E MPG across all years.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2016 Mercedes-Benz GLE550e at exactly $2,750. This figure is based on driving 15,000 miles per year, using the national average fuel price at the time of calculation. Your actual fuel cost will vary depending on how many miles you drive, your driving style, and the prevailing fuel prices in your area. The calculation assumes a certain percentage of both city and highway driving to reach that 15,000-mile total. Because the EPA data is a snapshot in time, those who own a 2016 GLE550e should be mindful of adapting their budgeting as fuel prices fluctuate.

Real-world expectations

While the EPA provides a standardized estimate, real-world fuel economy can vary considerably. The GLE550e is a plug-in hybrid, so your driving habits will significantly impact your gas mileage. If you frequently charge the battery and prioritize electric driving, especially on shorter trips, you will likely see better-than-rated fuel economy. If you rarely plug in the vehicle and rely primarily on the gasoline engine, you’ll probably see numbers closer to, or even below, the EPA estimates. Aggressive driving, frequent hard acceleration, and sustained high speeds will all negatively affect fuel efficiency. The hybrid system’s added weight also plays a role.

How it compares

The luxury SUV segment offers several alternatives. The 2016 BMW X5 xDrive40e, another plug-in hybrid, manages around 24 MPG combined. The Lexus RX 450h, a hybrid without plug-in capability, achieves approximately 30 MPG combined. Compared to these vehicles, the GLE550e highlights the balancing act Mercedes-Benz struck between performance, luxury, and efficiency.

Those prioritizing fuel economy above all else might lean towards the Lexus, while those needing more power may consider the BMW. The Audi Q7 available in 2016, even without a hybrid option, achieves around 22 MPG combined with its supercharged 3.0-liter V6, proving comparable efficiency without the electric complexity. All of all Mercedes Benz fuel economy data can be reviewed for model comparisons.

Tips to maximize efficiency

Prioritize plugging in. The GLE550e is a plug-in hybrid. To realize its potential fuel savings, make a habit of charging the battery whenever possible. Use home charging overnight and use public charging stations when available around town to maximize electric driving.

Drive conservatively. Avoid aggressive acceleration and braking, as this will deplete the battery charge quickly. Maintain a steady speed on the highway and anticipate traffic conditions to minimize unnecessary stops and starts. Take your foot off the throttle earlier than normal when approaching red lights.

Use the available driving modes strategically. The GLE550e offers different driving modes, such as electric-only, hybrid, and charge or save modes. Choose the most appropriate mode for your driving conditions. For short trips and city driving, prioritize electric-only mode. Save mode can be useful on the highway to conserve battery power for later use in urban areas.

Maintain proper tire inflation. Check your tire pressure regularly and inflate your tires to the recommended pressure. Underinflated tires increase rolling resistance and reduce fuel efficiency. This is even more important on a heavier vehicle such as this.