The 2018 Mercedes-Benz GLE350’s 20 MPG combined fuel economy won’t win any hypermiling contests, but it’s reasonable for a mid-size luxury SUV. This vehicle prioritizes comfort, prestige, and a smooth driving experience over ultimate fuel efficiency. The GLE350 3.5L isn’t for penny-pinchers; it’s aimed at affluent suburbanites, empty nesters, and families who value a prestigious badge, a plush cabin, and confident road manners. For them, fuel economy is a consideration, but not the deciding factor.

City and highway performance

The GLE350’s EPA estimates are 18 MPG in the city and 23 MPG on the highway. The city figure reflects the stop-and-go reality of suburban commutes and school drop-offs, where the 3.5L V6 engine works harder and less efficiently. The highway number is predictably better, benefitting from the automatic 7-speed transmission settling into its higher gears. This drivetrain offers relaxed cruising at freeway speeds, but is unlikely to ever be described as frugal. Those drawn to the GLE350 prioritize its poised handling and confident acceleration over squeezing every last mile from a gallon of gasoline. If efficiency is a high priority, shoppers should view all Mercedes Benz fuel economy data to see what models in the lineup are the most efficient.

Annual fuel cost

The EPA states the annual fuel cost for the 2018 Mercedes-Benz GLE350 is $2,900. This figure is calculated based on driving 15,000 miles per year and using national average fuel prices. It’s a helpful benchmark for comparing running costs with other vehicles, but individual expenses will fluctuate depending on driving habits and local gas prices. Consider this a starting point for budgeting, not a definitive prediction of your fuel expenses.

Real-world expectations

While the EPA provides a standardized testing methodology, real-world MPG can vary. Aggressive driving, frequent short trips, and heavy cargo loads will all negatively impact fuel economy. Conversely, gentle acceleration, consistent highway speeds, and diligent maintenance can help you approach, or even slightly exceed, the EPA estimates. Owners focused on fuel efficiency may even consider using premium fuel to maintain maximum efficiency.

How it compares

The GLE350’s fuel economy falls roughly in the middle of the luxury SUV segment. The BMW X5 35i (the closest competitor) achieves around 17 MPG city and 22 MPG highway in EPA testing, placing it close to the GLE350. The Acura MDX, with its V6 engine, fares slightly better at around 19 MPG city and 27 MPG highway. The Lexus RX 350 offers comparable comfort and luxury with around 20 MPG city and 27 MPG highway. Hybrid variants of these vehicles, such as the Lexus RX 450h, offer markedly improved fuel economy, but also a higher price tag. For buyers primarily concerned with superior fuel economy, the GLE350 MPG across all years will not measure up to its competitors.

Tips to maximize efficiency

The GLE350 benefits from smooth and gradual acceleration. Avoid sudden bursts of speed, which consume more fuel. Anticipate traffic flow to minimize the need for hard braking and acceleration. Allowing space in front of your vehicle can help you maintain momentum and improve fuel efficiency.

Tire pressure is important for fuel economy. Regularly check and maintain the recommended tire pressure listed on the driver’s side doorjamb. Underinflated tires create more rolling resistance, which reduces fuel efficiency. Proper tire inflation also contributes to improved handling and tire longevity.

Reduce unnecessary weight in the GLE350 by removing items from the cargo area and rear seats that are not essential. Excess weight increases the engine’s workload and decreases fuel economy. A lighter vehicle requires less energy to accelerate and maintain speed.

Plan your routes to avoid congested areas and minimize stop-and-go traffic. Use GPS navigation or traffic apps to identify alternative routes that bypass heavy traffic. Maintaining a consistent speed on less congested roads will improve fuel efficiency compared to navigating bumper-to-bumper traffic.

Consider using the GLE350’s Eco mode, if equipped. This driving mode adjusts engine and transmission settings to prioritize fuel efficiency. Eco mode typically reduces throttle response and shifts gears earlier, which results in smoother acceleration and improved MPG. However, use this mode sparingly when confident acceleration is required for safety.