21 MPG combined isn’t going to win any awards, but it’s the reality for drivers who prioritize a smooth, powerful, and luxurious driving experience over great fuel efficiency. The 2025 Mercedes-Benz GLE450 4matic delivers what its target buyer expects: a comfortable and capable mid-size SUV with ample power for confident highway merging and effortless cruising. These drivers, often affluent suburban families or successful professionals, understand that a certain level of fuel consumption comes with owning a premium vehicle with a refined engine and all-wheel-drive system.

City and highway performance

The EPA estimates the GLE450 4matic achieves 19 MPG in the city and 25 MPG on the highway. The city figure reflects stop-and-go traffic, where the GLE450’s weight and standard all-wheel drive demand more fuel. On the open road, the 25 MPG highway figure is more respectable, aided by the smooth-shifting 9-speed automatic transmission and the engine’s ability to cruise comfortably at lower RPMs. This split in fuel economy reinforces the GLE450’s role as a versatile vehicle, capable of handling daily commutes and longer road trips with equal aplomb, even if it’s not the most frugal choice for either.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2025 Mercedes-Benz GLE450 4matic at $2,750. This calculation is based on driving 15,000 miles per year and assumes the use of gasoline priced at the national average. Your actual fuel costs will vary depending on your driving habits, the type of driving you do (city versus highway), and local fuel prices. For GLE450 owners, who typically prioritize premium features and performance, this fuel expense is often factored into the overall cost of ownership and is considered an acceptable trade-off for the vehicle’s capabilities.

Real-world expectations

While the EPA provides a standardized benchmark, real-world MPG often deviates. GLE450 drivers who spend more time in congested city environments may see lower figures, while those who primarily drive on highways can expect to be closer to the 25 MPG estimate. Aggressive driving habits, frequent use of the vehicle’s powerful acceleration, and carrying heavy loads will also negatively impact fuel economy. Conversely, careful driving, anticipating traffic flow, and minimizing unnecessary acceleration can help drivers achieve fuel economy figures that are closer to the EPA estimates. Remember to check GLE450 MPG across all years to see if your older models return significantly different MPG.

How it compares

The GLE450 exists in a competitive segment. The BMW X5 xDrive40i, a direct rival, achieves a slightly better 23 MPG combined. The Acura MDX, equipped with SH-AWD, lands closer to 21 MPG combined. These differences, while seemingly small, can add up over time. However, the GLE450 buyer isn’t solely focused on maximizing MPG, or they would be looking at vehicles completely outside this segment. They value the Mercedes-Benz brand, the interior appointments, ride, and the overall driving experience. While fuel costs are a consideration, the GLE450’s blend of performance, luxury, and technology often outweighs the MPG differences of its competitors. For a look at all Mercedes Benz fuel economy data, click here.

Tips to maximize efficiency

Take advantage of the GLE450’s driving modes. The “Comfort” mode is designed for everyday driving and optimizes fuel efficiency by adjusting throttle response and transmission shift points. Avoiding “Sport” or “Sport+” modes during routine commutes can make a noticeable difference in fuel consumption.

Tire pressure is often overlooked. Ensure your tires are properly inflated to the pressures listed on the door jamb sticker. Underinflated tires create more rolling resistance, which negatively affects fuel economy. Regularly check and maintain the correct tire pressure for optimal performance.

Minimize idling time. Modern engines are designed to be efficient, and idling consumes fuel without covering any distance. If you anticipate being stopped for more than a minute, it’s generally more fuel-efficient to turn off the engine. The GLE450’s start/stop system can also prove useful in many situations.

Regularly service your GLE450. A well-maintained engine operates more efficiently. Follow the recommended maintenance schedule, including oil changes, air filter replacements, and spark plug inspections, to ensure your engine is running at its best and delivering optimal fuel economy.