26 MPG combined places the 2026 Mercedes-Benz CLE450 4MATIC Coupe firmly within the realm of efficient luxury, a notable achievement for a stylish, two-door grand tourer powered by a strong 3.0-liter inline-six and equipped with standard all-wheel drive. This isn’t a vehicle chasing outlandish economy figures. Its combined MPG reflects a balance between the refined performance expected of a Mercedes-Benz and a pragmatic sensibility often overlooked in the segment. The CLE450 is for the buyer who appreciates elegant design, exhilarating yet comfortable daily driving, and the confidence of 4MATIC, without suffering the frequent fill-ups often associated with vehicles offering similar power and luxury. These individuals value the Mercedes-Benz badge not just for its prestige, but for its engineering prowess which delivers both spirited acceleration and respectable fuel consumption.

City and Highway Performance

Looking closer into the 26 MPG combined figure, the CLE450 4MATIC Coupe delivers 23 MPG in city driving and an impressive 33 MPG on the highway. The city figure, at 23 MPG, is quite competitive for a 3.0-liter six-cylinder engine, even with the benefit of mild-hybrid assistance and a smooth 9-speed automatic transmission efficiently shuffling gears. Mercedes-Benz’s engineering ensures that stop-and-go traffic isn’t an excessively thirsty affair. On the open road, the 33 MPG highway rating truly shines. This is where the CLE450’s powertrain and aerodynamic profile come into their own, allowing for long-distance cruising with remarkable efficiency. This translates directly to fewer interruptions at the pump during extended journeys, enhancing the grand touring experience. The CLE450’s highway efficiency underscores its mission as a capable long-distance cruiser, providing powerful overtaking capabilities while maintaining a respectable fuel budget. Information on CLE450 MPG across all years is available for comparison.

Annual fuel cost

The EPA estimates an annual fuel cost of $2,250 for the 2026 Mercedes-Benz CLE450 4MATIC Coupe. This figure is based on a standard methodology assuming 15,000 miles driven per year, split between city and highway driving, and using national average fuel prices. This $2,250 covers the typical fuel expenses for an average driver, providing a tangible benchmark for budgeting. For the CLE450 buyer, this isn’t likely a primary concern driving their purchase decision, but it certainly offers peace of mind. They purchase this vehicle primarily for its blend of luxury, performance, and style, but an annual fuel cost that doesn’t break the bank adds to the overall value. It reinforces the car’s balanced character capable of spirited driving without being unduly punishing at the pump. This estimated cost positions the CLE450 favorably against other luxury coupes, offering a blend of driving enjoyment and reasonable running costs.

Real-world expectations

In real-world driving, the 2026 CLE450 4MATIC Coupe’s fuel economy will naturally vary based on driver habits, traffic conditions, and terrain. Aggressive driving, with frequent hard acceleration and braking, will inevitably see consumption trend towards the lower end of the EPA’s estimates, potentially dipping below the 23 MPG city figure. Conversely, a smooth, measured driving style, anticipating traffic and maintaining consistent speeds, particularly on the highway, could push efficiency slightly above the 33 MPG highway rating. The mild-hybrid system, with its integrated starter-generator, plays a crucial role here, providing a meaningful boost during acceleration and allowing for smoother, more efficient engine restarts. Drivers who frequently find themselves in stop-and-go urban environments will appreciate its contribution, as will those who embark on frequent highway excursions. The CLE450’s character intrinsically encourages a more relaxed, confident driving style, which often aligns well with achieving good fuel numbers.

How it compares

When stacked against its primary competitors, the 2026 Mercedes-Benz CLE450 4MATIC Coupe presents a strong picture of efficiency within the luxury coupe segment. Consider the BMW 440i xDrive Coupe, powered by a similar 3.0-liter turbocharged inline-six, which typically registers around 27 MPG combined (24 city / 32 highway). The Audi A5 45 TFSI quattro, though typically using a 2.0-liter four-cylinder, achieves around 28 MPG combined (24 city / 32 highway), making the CLE450’s six-cylinder efficiency particularly impressive. Even the highly focused Porsche 718 Cayman, with its 2.0-liter turbo four, manages approximately 24 MPG combined (21 city / 27 highway), highlighting the CLE450’s strong highway performance compared to pure sports cars. The CLE450 buyer often cross-shops these vehicles, and while outright performance or brand allegiance might be primary drivers, the strong fuel economy figures of the CLE450 often sway those who appreciate a more balanced vehicle. It offers the power and refinement on par with its six-cylinder rivals, sometimes even exceeding their highway efficiency. The CLE450 demonstrates that a luxurious, powerful coupe doesn’t require a significant compromise on fuel consumption, especially when compared to all Mercedes Benz fuel economy data.

Tips to maximize efficiency

Maintaining consistent throttle input is important. The CLE450’s 9-speed automatic transmission is designed to keep the engine operating in its most efficient band, but abrupt acceleration and deceleration will negate this benefit. Smooth, progressive inputs allow the transmission to upshift earlier and use the engine’s torque effectively for better mileage.

Regular maintenance, following Mercedes-Benz’s recommended service schedule, is critical. Ensuring proper tire pressure, clean air filters, and fresh spark plugs directly impacts engine efficiency and overall fuel consumption. Neglecting these basics will invariably lead to poorer MPG figures over time and potentially higher running costs.

Use the ECO driving mode. While the CLE450 offers various drive modes, selecting ECO will optimize powertrain response, climate control, and other vehicle systems to prioritize fuel economy. This mode works particularly well in urban environments or during light-traffic highway cruising.

Anticipate traffic conditions to avoid unnecessary braking and acceleration. Looking ahead for red lights or slowing traffic allows for gradual deceleration and smoother acceleration, which significantly reduces fuel waste. The mild-hybrid system’s coasting capability is most effective when driving smoothly.

Minimize additional weight and aerodynamic drag. While not a common issue for a luxury coupe, ensure unnecessary items are removed from the trunk. For those contemplating aftermarket accessories, choose options that don’t significantly increase drag, especially for highway driving where aerodynamics play a larger role in efficiency.