21 MPG combined isn’t going to win any awards, but it’s the price of admission for the unique capabilities offered by the 2018 Mercedes-Benz GLE550e 4matic. This isn’t a vehicle purchased for its fuel efficiency; it’s chosen for its smooth blend of luxury, performance, and the added benefit of limited electric-only driving. The typical buyer is affluent, wants a premium SUV badge, and appreciates the plug-in hybrid’s ability to handle short commutes or errands on electric power, reducing their gas use while still enjoying a powerful V6 engine when needed.

City and highway performance

The EPA estimates 20 MPG in the city and 23 MPG on the highway for the GLE550e. While these figures might not impress compared to some hybrid rivals, it’s essential to remember the GLE550e’s weight and the power it delivers. The all-wheel-drive system adds mass, and the 3.0-liter V6, combined with the electric motor, prioritizes effortless acceleration over outright fuel sipping. In real-world driving, achieving these numbers depends heavily on driving style and how often you charge the battery. Frequent charging and using electric-only mode in urban situations can significantly improve city MPG, while sustained high-speed highway driving will likely yield results closer to the EPA estimate.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2018 Mercedes-Benz GLE550e at exactly $2,750. This figure is based on driving 15,000 miles per year and using the national average fuel price at the time of calculation. It’s a standardized figure, meaning your actual fuel cost could be higher or lower based on your driving habits, local fuel prices, and the amount of electric driving you do. For example, someone who primarily drives short distances and plugs in their GLE550e often could see significantly lower fuel costs than someone who relies mainly on the gasoline engine.

Real-world expectations

Don’t expect to consistently achieve the EPA’s combined 21 MPG if you treat the GLE550e like a regular SUV. The point of the plug-in hybrid system is to use electric power whenever possible. If you don’t charge the battery, the efficiency will plummet, and you’re essentially driving a heavy V6-powered SUV. However, with regular charging and strategic use of electric mode for shorter trips, it’s entirely possible to exceed the EPA’s city MPG estimate. Highway fuel economy will be more consistent, but even there, careful throttle management and using cruise control can make a difference. Consider the GLE550e’s MPG as a highly variable number dependent on driver behavior. Before buying, consider reading GLE550E MPG across all years to better understand expected performance over your ownership experience.

How it compares

Compared to non-hybrid rivals in the same class, the GLE550e holds its own. The BMW X5 xDrive40i, for example, achieves around 22 MPG combined, but lacks the plug-in capability. The Volvo XC90 T8 eAWD plug-in hybrid offers similar electric range, and achieves around 27 MPG combined when accounting for both electric and gasoline operation. The Lexus RX 450h, a hybrid but not a plug-in, manages around 31 MPG combined, but lacks the same level of performance as the GLE550e. These comparisons matter to many GLE550e buyers because they highlight the trade-offs. The GLE550e compromises slightly on ultimate fuel efficiency for a more engaging driving experience and the prestige of the Mercedes-Benz badge.

Tips to maximize efficiency

Prioritize charging the battery whenever possible. Plug in at home overnight, and take advantage of charging stations at work or in public areas. This maximizes the use of electric power, reducing gasoline consumption, especially during city driving. The battery’s state of charge directly impacts your fuel economy, so treat charging like fueling up, but with electricity.

Use the GLE550e’s driving modes effectively. Select “Electric” mode for short commutes and errands around town to avoid using the gasoline engine entirely. Use “Hybrid” mode for longer journeys, allowing the system to intelligently blend electric and gasoline power for optimal efficiency. “Comfort” is a good default setting, while “Sport” will prioritize performance over economy.

Avoid aggressive acceleration and braking. Smooth and gradual inputs are key to maximizing fuel efficiency in any vehicle, and especially in a hybrid. The regenerative braking system can capture energy during deceleration, but only if you brake gently. Hard acceleration burns fuel quickly, negating any potential savings from electric driving.

Keep your tires properly inflated. Underinflated tires create more rolling resistance, which reduces fuel efficiency. Check your tire pressure regularly and inflate them to the recommended level, usually found on a sticker on the driver’s side doorjamb. This is a simple but effective way to improve MPG.

Consider the weight you’re carrying. Extra cargo adds weight and increases fuel consumption. Remove any unnecessary items from your vehicle. While this might seem minor, every little bit helps, especially on longer trips. Remember to check all Mercedes Benz fuel economy data to help inform your vehicle ownership choices.