While the 2016 Mercedes-Benz CLS400 3.0L 6-cyl gets 24 MPG combined, it’s a reasonable choice for drivers wanting a sleek four-door coupe with a luxurious interior and spirited performance. This isn’t a car for bargain hunters. People buy it because they want style, comfort, and brand appeal over maximizing fuel efficiency. The CLS400 buyer knows that a powerful, responsive engine and a refined driving experience have a cost. This fuel consumption is part of that.

City and highway performance

The CLS400’s fuel economy breaks down to an EPA-estimated 20 MPG in the city and 29 MPG on the highway. The city figure reflects stop-and-go traffic, where the engine works harder and aerodynamic design provides little benefit. However, the 29 MPG highway rating shows the CLS400’s potential for efficiency during longer cruises. The 7-speed automatic transmission is important here, allowing the engine to operate at lower RPMs at higher speeds, which reduces fuel consumption and cabin noise. This split in MPG ratings reflects that the car can navigate urban environments in style, and can easily handle long highway drives.

Annual fuel cost

According to the EPA, the estimated annual fuel cost for the 2016 Mercedes-Benz CLS400 is $2,400. This calculation is based on driving 15,000 miles per year and using national average fuel prices. Of course, your actual fuel costs will vary depending on your driving habits, the type of fuel you use (premium is recommended for optimal performance), and local fuel prices. Drivers who primarily stick to city driving and have a heavy foot will likely see costs exceed this estimate, while those who spend more time on the open road and prioritize fuel efficiency may spend less.

Real-world expectations

While the EPA provides an estimate, real-world fuel economy can change based on many things. Aggressive acceleration, frequent hard braking, and carrying extra weight will negatively impact fuel efficiency. But, smooth driving and following speed limits can help you achieve or surpass the EPA estimates. The CLS400’s turbocharged engine delivers ample power, but using that power a lot will decrease your MPG. Watch the car’s onboard fuel economy display to better understand your driving and its impact on fuel consumption. You can also find CLS400 MPG across all years.

How it compares

Among luxury four-door coupes, the CLS400’s fuel economy is average. A comparable BMW 640i Gran Coupe from the same year, with its 3.0L inline-six, also delivers around 20 MPG city and 29 MPG highway. However, a slightly smaller Audi A7 with its supercharged 3.0L V6 offers similar performance but often gets slightly better fuel economy of around 21 MPG city and 30 MPG highway. Moving up to the higher-performance CLS63 AMG with its powerful V8 engine will significantly lower fuel economy, often in the mid-teens for combined MPG. The CLS400 offers a respectable level of performance without using too much fuel. If you are looking for more or less efficient Mercedes Benz vehicles, you might want to browse all Mercedes Benz fuel economy data to find something that fits your needs better.

Tips to maximize efficiency

Ensure your tires are properly inflated to the recommended pressure. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Check your tire pressure regularly, especially during changes in temperature, for fuel economy and tire life.

Avoid idling. If you’re stopped for more than a minute, turn off the engine. Modern engines restart quickly, and idling consumes fuel without moving.

Use cruise control on the highway when you can. Maintaining a consistent speed minimizes unnecessary acceleration and deceleration, which can improve fuel economy. Watch traffic and avoid using cruise control in hilly areas, where the transmission may downshift often.

Minimize air conditioning when possible. The AC compressor strains the engine, reducing fuel efficiency. When the weather allows, open the windows or use the ventilation system instead. If you need air conditioning, use it carefully and avoid setting the temperature too low.