Mercedes CLS Class MPG: Unbelievable Fuel Efficiency

The Mercedes CLS Class offers impressive fuel economy, with various models achieving 22-31 MPG combined. This blend of luxury, performance, and surprising efficiency makes it a compelling choice for discerning drivers. From highway cruising to city commutes, the CLS delivers an exceptional driving experience without the excessive fuel stops.

The Mercedes-Benz CLS Class is often seen as the epitome of luxury and performance. Many enthusiasts wonder if such a sophisticated and powerful vehicle can also be kind to their wallets at the pump. It’s a fair question, especially with rising fuel costs. You might be surprised to learn that the CLS Class boasts remarkably good fuel efficiency for a car in its class. This means you can enjoy that signature Mercedes-Benz driving experience – the smooth ride, the advanced technology, and the undeniable prestige – without constantly worrying about your MPG. We’re going to dive deep into what makes the CLS so fuel-conscious and what you can expect.

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Understanding Mercedes CLS Class MPG: What You Need to Know

When we talk about Mercedes-Benz CLS MPG, we’re delving into a fascinating intersection of automotive engineering and efficient design. Mercedes-Benz has consistently pushed the boundaries, integrating innovative technologies to optimize fuel consumption across its lineup, and the CLS is no exception. It’s not just about raw power; it’s about intelligent power delivery.

This luxury four-door coupe isn’t just a pretty face. It’s engineered with a keen eye on efficiency, making it a sensible choice for those who appreciate both spirited driving and responsible fuel usage. Let’s break down how they achieve this.

The Engineering Behind CLS Fuel Efficiency

Mercedes-Benz employs a suite of advanced technologies to make the CLS Class as fuel-efficient as possible. These aren’t just minor tweaks; they are fundamental engineering principles woven into the fabric of the vehicle.

Advanced Powertrains: Modern CLS models often feature turbocharged engines that deliver robust performance while operating more efficiently than naturally aspirated engines of the past. Turbocharging allows smaller engines to produce more power, and when combined with sophisticated engine management systems, it leads to better fuel economy.
Direct Fuel Injection: This technology precisely injects fuel directly into the combustion chamber, optimizing the fuel-air mixture for maximum efficiency and power.
ECO Start/Stop System: This standard feature automatically shuts off the engine when the vehicle is at a standstill (like at traffic lights or in stop-and-go traffic) and restarts it instantly and smoothly when you’re ready to move again. This significantly reduces fuel consumption in urban driving.
Aerodynamics: The CLS Class boasts a sleek, coupe-like silhouette. This design isn’t just for aesthetics; its low drag coefficient minimizes air resistance on the road, allowing the engine to work less, especially at higher speeds.
Transmission Technology: Modern automatic transmissions, often with 7, 8, or even 9 speeds, are designed to keep the engine operating within its most efficient RPM range for longer periods. They allow for smoother shifts and more direct power transfer.
Lightweight Materials: Where possible, Mercedes-Benz utilizes lighter materials in the CLS construction. Reducing vehicle weight is a fundamental way to improve fuel economy, as less energy is required to accelerate and maintain speed.

Factors Influencing Your CLS MPG

While the CLS Class is engineered for efficiency, your real-world fuel economy can vary. Several factors play a crucial role:

Driving Style: Aggressive acceleration and braking consume significantly more fuel than smooth, steady driving. Anticipating traffic flow and maintaining a consistent speed is key.
Driving Conditions: City driving with frequent stops and starts will yield lower MPG than highway cruising. Uphill driving also requires more energy.
Vehicle Maintenance: A well-maintained vehicle runs more efficiently. Ensuring your tires are properly inflated, your engine oil is clean, and your filters are replaced as recommended can make a difference. For example, properly inflated tires reduce rolling resistance. According to fueleconomy.gov, underinflated tires can lower your MPG by as much as 3%.
Environmental Factors: Cold weather can temporarily reduce fuel efficiency as the engine takes longer to reach optimal operating temperature, and fuel mixtures may be adjusted.
Load: Carrying extra weight in the vehicle will increase fuel consumption.

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Mercedes CLS Class MPG by Generation and Model

The fuel economy of the Mercedes CLS Class can vary quite a bit depending on the specific generation and the engine option chosen. Mercedes-Benz has offered a range of powertrains over the years, from efficient four-cylinders (in later models) to potent V8s, and even AMG variants that prioritize performance, though still with surprising efficiency for their power output.

Here’s a look at typical MPG figures, generally based on EPA estimates for different CLS models. Keep in mind these are estimates and real-world results will vary.

First Generation CLS (2005-2010) – C219

The initial CLS models focused more on style and luxury, with larger displacement engines providing smooth power delivery.

| Model | Engine | Transmission | City MPG (Est.) | Highway MPG (Est.) | Combined MPG (Est.) |
| :——————– | :———- | :———– | :————– | :—————– | :—————— |
| CLS 350 | 3.5L V6 | 7-speed Auto | 17 | 25 | 20 |
| CLS 500 | 5.0L V8 | 7-speed Auto | 16 | 24 | 19 |
| CLS 55 AMG | 5.4L V8 | 5-speed Auto | 14 | 21 | 16 |
| CLS 63 AMG | 6.2L V8 | 7-speed Auto | 13 | 20 | 15 |

Second Generation CLS (2011-2017) – C218

This generation saw more widespread adoption of advanced technologies and more fuel-efficient engine options, including a diesel and a more potent but still efficient V6.

| Model | Engine | Transmission | City MPG (Est.) | Highway MPG (Est.) | Combined MPG (Est.) |
| :——————– | :———- | :———– | :————– | :—————– | :—————— |
| CLS 350 (RWD) | 3.5L V6 | 7-speed Auto | 19 | 29 | 23 |
| CLS 350 (4MATIC) | 3.5L V6 | 7-speed Auto | 18 | 27 | 21 |
| CLS 550 (RWD) | 4.7L V8 | 7-speed Auto | 17 | 25 | 20 |
| CLS 550 (4MATIC) | 4.7L V8 | 7-speed Auto | 17 | 24 | 19 |
| CLS 250 CDI (Diesel) | 2.1L I4 | 7-speed Auto | 27 | 38 | 31 |
| CLS 63 AMG | 5.5L V8 Bi-Turbo | 7-speed Auto | 17 | 26 | 20 |

Third Generation CLS (2018-Present) – C257

The current generation CLS emphasizes further efficiency improvements, often utilizing mild-hybrid technology and more advanced turbocharging.

| Model | Engine | Transmission | City MPG (Est.) | Highway MPG (Est.) | Combined MPG (Est.) |
| :——————– | :———- | :———– | :————– | :—————– | :—————— |
| CLS 450 4MATIC Coupe | 3.0L I6 w/ EQ Boost | 9-speed Auto | 22 | 30 | 25 |
| CLS 53 AMG 4MATIC+ | 3.0L I6 Bi-Turbo w/ EQ Boost | 9-speed Auto | 20 | 26 | 22 |
| CLS 350 d (Diesel) | 2.9L I6 Diesel | 9-speed Auto | 33 | 48 | 39 |
| CLS 400 d 4MATIC | 2.9L I6 Diesel | 9-speed Auto | 30 | 42 | 35 |

Note: MPG figures are estimates and can vary based on specific market configurations, options, and driving conditions. Always refer to your vehicle’s official EPA estimates or local equivalent.

The Rise of Mild-Hybrid Technology (EQ Boost)

One of the most significant advancements in recent CLS models is the integration of mild-hybrid systems, often branded as EQ Boost. These systems use a 48-volt electrical system to support the gasoline engine with functions like:

Electric assist: Providing a small boost of acceleration from a standstill.
Deceleration energy recovery: Capturing energy during braking to recharge the battery.
Smoothing engine operation: Making start/stop transitions seamless and improving overall responsiveness.

This technology enhances both performance and fuel efficiency, contributing to the impressive MPG figures seen in the latest CLS generations.

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Maximizing Your Mercedes CLS Class MPG

Even with the inherent efficiencies built into your CLS, there are practical steps you can take to squeeze out every possible mile per gallon. Think of it as optimizing your luxury experience.

Driving Habits for Better Fuel Economy

Your driving style has a monumental impact on your MPG. Adopting a few simple habits can lead to noticeable savings.

Smooth Acceleration and Braking: Avoid sudden bursts of speed and hard braking. Accelerate gently and anticipate stops by easing off the throttle early. This allows the engine to operate in its most efficient range and reduces wear on your brakes.
Maintain a Steady Speed: On highways, use cruise control whenever practical and safe. Constant speed variations waste fuel more than you might think.
Observe Speed Limits: Higher speeds dramatically increase aerodynamic drag. The faster you go, the more fuel your CLS will consume. Sticking to speed limits not only saves fuel but also enhances safety and reduces the risk of speeding tickets.
Minimize Idling: If you anticipate being stopped for more than 30 seconds (e.g., waiting for someone, long traffic lights), consider turning off the engine, especially if your CLS doesn’t have the ECO Start/Stop system engaged or enabled.

Vehicle Maintenance: The Key to Efficiency

A well-maintained CLS runs at peak efficiency. Regular servicing ensures all systems are functioning optimally.

Regular Service Intervals: Follow the recommended maintenance schedule in your owner’s manual. This includes oil changes, filter replacements (air and fuel), and spark plug checks. Clean filters ensure the engine can breathe properly, while fresh oil reduces friction.
Tire Pressure: Underinflated tires increase rolling resistance, forcing your engine to work harder. Check your tire pressure regularly (at least once a month) and inflate them to the manufacturer’s recommended PSI, typically found on a sticker in the driver’s side doorjamb. You can research proper tire maintenance through resources like NHTSA’s tire safety page.
Wheel Alignment: Misaligned wheels can cause tires to drag, increasing resistance and fuel consumption, as well as uneven tire wear. Have your alignment checked if you notice pulling or uneven tire wear.
Engine Tune-Ups: Ensure your engine is running smoothly. Issues like faulty oxygen sensors or spark plugs can significantly impact fuel efficiency. If your check engine light comes on, it’s crucial to have it diagnosed and repaired promptly.

Smart Use of Features

Modern Mercedes-Benz vehicles are packed with features. Using them wisely can also contribute to better MPG.

Climate Control: While the climate control system is designed for comfort, extreme settings can increase fuel usage, especially the air conditioning compressor. Using moderate settings and the recirculation function can help.
ECO Mode: If your CLS has different drive modes (e.g., ECO, Comfort, Sport), using the ECO mode will typically adjust throttle response, transmission shifting, and climate control to prioritize fuel efficiency.

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Luxury and Performance: Can You Have It All?

The question often arises: does focusing on fuel efficiency mean sacrificing the exhilarating performance that Mercedes-Benz, and particularly the CLS Class, is known for? The answer, thankfully, is a resounding no.

Mercedes-Benz has masterfully blended the two. The advanced engineering we discussed – turbocharged engines, direct injection, EQ Boost mild-hybrid systems – provides a potent combination of power and efficiency. The CLS class offers powerful acceleration and a dynamic driving experience without demanding a consistently high fuel bill, especially when compared to older or less technologically advanced luxury sedans.

For instance, the CLS 450 4MATIC Coupe, with its inline-six engine and EQ Boost, offers brisk acceleration and a refined driving feel while achieving respectable MPG figures. Even the more performance-oriented AMG CLS 53 4MATIC+ manages to deliver its thrilling performance with surprisingly acceptable fuel economy numbers for a car of its caliber, thanks to its hybrid assistance and efficient engine design.

This means drivers can enjoy the luxury, the comfort, the advanced technology, and the dynamic handling that defines the CLS, all while benefiting from a fuel efficiency that makes it a practical choice for daily driving and longer journeys alike. It’s a testament to Mercedes-Benz’s commitment to innovation – delivering vehicles that are not only desirable but also intelligently designed to meet the evolving needs of drivers who want it all.

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Frequently Asked Questions (FAQ) about Mercedes CLS Class MPG

Here are some answers to common questions about the fuel economy of the Mercedes CLS Class.

What is the average MPG for a Mercedes CLS Class?

The average MPG for a CLS Class generally ranges from 20 MPG combined for older V8 models up to 30-35 MPG combined for newer, more efficient diesel or mild-hybrid gasoline models. Specific figures depend heavily on the model year, engine, drivetrain (RWD vs. 4MATIC), and driving conditions.

Are Mercedes CLS Diesels fuel-efficient?

Yes, Mercedes CLS diesel models are notably fuel-efficient. For example, models like the CLS 250 CDI (Second Generation) or the CLS 350 d/400 d (Third Generation) offer significantly higher MPG than their gasoline counterparts, especially on the highway, thanks to the inherent efficiency of diesel engines and their torque characteristics.

Does the CLS 550 get good gas mileage?

The CLS 550, typically equipped with a V8 twin-turbo engine, offers a good balance of performance and economy for its class. Earlier models might see around 17-19 MPG combined, while newer iterations with more advanced technology can approach 20 MPG combined. While not as high as smaller engines, it’s impressive for a luxury V8 performance sedan.

How does the CLS 450’s MPG compare to older V8 CLS models?

The CLS 450, particularly those with the 3.0L inline-six engine and EQ Boost mild-hybrid technology, generally achieves better combined MPG than older V8 CLS 550 models. The CLS 450 typically offers around 22-25 MPG combined, whereas older V8s were often in the 19-20 MPG combined range.

Does 4MATIC (All-Wheel Drive) affect CLS MPG?

Yes, 4MATIC all-wheel-drive systems typically result in a slight decrease in fuel efficiency. The added weight and drivetrain components of AWD can reduce MPG by 1-2 MPG on average compared to rear-wheel-drive (RWD) versions of the same model. However, the difference is often minimal in modern Mercedes-Benz vehicles.

What is EQ Boost and how does it impact CLS MPG?

EQ Boost is a mild-hybrid system found in newer CLS models (like the CLS 450 and AMG CLS 53). It uses a 48-volt electrical system to provide electric assistance during acceleration, enable smoother engine start/stop functionality, and recapture energy during braking. This system helps to improve both performance and fuel efficiency, often by 1-2 MPG combined over non-hybrid equivalents.

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The Verdict: Is the CLS Class a Fuel-Efficient Luxury Choice?

When you consider its stylish design, luxurious appointments, advanced technology, and strong performance, the Mercedes-Benz CLS Class stands out as a remarkably fuel-efficient luxury vehicle. Mercedes-Benz has consistently applied intelligent engineering and innovative technology to optimize fuel consumption across its model range, and the CLS is a prime example of this commitment.

Whether you’re looking at the efficient diesel options, the gasoline models with advanced turbocharging and direct injection, or the latest iterations featuring mild-hybrid EQ Boost technology, the CLS consistently offers impressive MPG figures for its segment. This means you can indulge in the prestige and driving pleasure of a Mercedes-Benz without the guilt or the frequent stops at the gas station.

By understanding the factors that influence your CLS’s fuel economy and by adopting smart driving habits and maintaining your