26 MPG combined makes the 2026 Mercedes-Benz CLE300 4matic Convertible an efficient open-top luxury cruiser, an admirable figure for a vehicle designed primarily for experience and aesthetic, yet still delivering a commendably miserly thirst for premium unleaded.

City and highway performance

The 2.0L 4-cylinder engine, paired with the smooth 9-speed automatic transmission, delivers its rated 23 MPG in the city and a surprisingly strong 32 MPG on the open highway. This isn’t groundbreaking for an economy car, but for a luxury convertible with standard all-wheel drive, it represents a well-executed balance. The CLE300 isn’t about outright speed, but about effortless poise, and its drivetrain reflects this. In urban confines, the turbo-four provides ample torque for quick maneuvers and smooth acceleration, remaining impressively refined even with the top down. On longer journeys, that 32 MPG highway figure is particularly noteworthy. It means that leisurely coastal drives or extended weekend escapes won’t be constantly interrupted by fuel stops, nor will they punish the owner with excessive running costs. This blend of urban agility and highway efficiency perfectly suits the CLE300 convertible’s mission: a comfortable cruiser that can tackle daily commutes with grace but truly shines on scenic routes.

Annual fuel cost

The EPA estimates an annual fuel cost of $2,250 for the 2026 Mercedes-Benz CLE300 4matic Convertible. This figure is based on driving an average of 15,000 miles per year, with a split of 45% highway and 55% city driving, and at national average fuel prices. For a German luxury convertible, this is a very manageable cost. Owners of the CLE300 are typically affluent individuals who value brand prestige, design, and a refined driving experience. While outright fuel economy isn’t their primary purchase driver, unexpected high running costs can certainly detract from the ownership experience. This $2,250 annual estimate confirms that the CLE300 offers a genuine luxury experience without excessive financial penalties at the pump, ensuring that the joy of top-down motoring remains largely untaxed by fuel expenditures.

Real-world expectations

Anticipate the 26 MPG combined figure to be largely achievable in typical driving scenarios, provided you don’t consistently exploit the 2.0L turbo-four’s full potential. The 9-speed automatic is geared for efficiency, eager to upshift and keep the engine in its most economical rev range. Drivers who embrace the CLE300’s relaxed, touring demeanor will find the EPA estimates realistic. Aggressive driving, frequent low-speed urban crawls with extensive idling, or consistently pushing the car hard on twisty roads, will naturally see figures dip closer to the city rating or even below. However, the mild-hybrid system, subtly assisting during acceleration and allowing for smooth start/stop operation, helps to mitigate some of these drains on efficiency. The CLE300’s real-world efficiency aligns with its character: it’s a car designed to be enjoyed at a comfortable pace, and those who drive it as such will be rewarded with good fuel mileage.

How it compares

The CLE300 4matic Convertible sits in a competitive but niche segment, and its 26 MPG combined places it favorably against key rivals. Consider the 2024 BMW 430i xDrive Convertible, which, despite its similar 2.0L turbo-four and all-wheel drive, manages 27 MPG Combined (23 City / 33 Highway). This slight edge for BMW is marginal and likely imperceptible in daily driving. The Audi A5 Cabriolet 45 TFSI quattro, another direct competitor with a 2.0L engine, posts an identical 26 MPG Combined (24 City / 32 Highway). Mercedes-Benz clearly benchmarked its rivals effectively. For those considering stepping up in power, the Mercedes-Benz CLE450 4matic Convertible, with its larger 3.0L inline-six, naturally sees a drop to around 24 MPG Combined (21 City / 29 Highway). This comparison underscores that the CLE300 delivers strong luxury convertible aesthetics and features without the commensurate fuel economy penalty of its more powerful sibling or significantly lagging behind its primary competitors. When considering all Mercedes Benz fuel economy data, the CLE300 is a smart choice balancing performance, luxury, and sensible running costs.

Tips to maximize efficiency

The CLE300’s mild-hybrid system operates most efficiently when drivers adopt a smooth, progressive approach. Ease into the throttle rather than stomping on it, allowing the electric motor to assist in initial acceleration and reduce the strain on the gasoline engine. This subtle driving style will significantly improve your daily MPG.

Use the vehicle’s driving modes. “Eco” mode, specifically engineered to optimize fuel consumption, will dull throttle response and adjust transmission shift points to prioritize efficiency. For routine commutes or long highway cruises, this mode offers tangible benefits without sacrificing too much comfort.

Proper tire inflation is a simple yet often overlooked factor in fuel economy. Regularly check your tire pressures, especially before longer trips. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel to maintain speed.

When the opportunity arises, engage in “coast-friendly” driving. Lift off the accelerator earlier when approaching uphill gradients or traffic lights. The CLE300’s powertrain is designed to recuperate energy during deceleration, and allowing the car to coast longer maximizes this energy recovery.