26 MPG combined. That’s what the 2020 Mercedes-Benz CLS450 4matic delivers, and while it won’t win any hypermiling contests, it’s a respectable figure for a sleek, powerful coupe-like sedan with all-wheel drive. The CLS isn’t about prioritizing fuel savings above all else. It’s about making a statement, blending luxury with a sporty look, and enjoying a refined driving experience. The buyer isn’t primarily motivated by saving pennies at the pump; they’re drawn to the CLS’s unique style and performance. They accept the fuel economy as part of the package, a trade-off for the head-turning design and effortless power.

City and highway performance

The EPA estimates peg the 2020 CLS450 4matic at 23 MPG in the city and 30 MPG on the highway. The city number reflects the stop-and-go nature of urban driving, where the engine spends more time idling and accelerating, impacting fuel efficiency. However, the 30 MPG highway figure demonstrates the engine’s ability to cruise efficiently at higher speeds, thanks to the smooth-shifting 9-speed automatic transmission. This gearbox keeps the engine in its sweet spot, balancing power delivery with fuel conservation on long journeys.

Annual fuel cost

The EPA calculates the annual fuel cost for the 2020 Mercedes-Benz CLS450 4matic at precisely $2,250. This figure is based on driving 15,000 miles per year, assuming an average fuel price that represents a national norm. It’s important to remember that this is an estimate. Your actual fuel costs will vary depending on your driving habits, the type of fuel you use, and prevailing gas prices in your area. Someone who drives predominantly in the city is likely to exceed this cost, while someone who does mostly highway driving might see a slightly lower figure.

Real-world expectations

While the EPA provides a standardized benchmark, real-world fuel economy can differ. The CLS450’s 3.0L inline-six engine, boosted by a mild-hybrid system, offers strong performance, which encourages a more spirited driving style that naturally lowers the MPG. And the 4matic all-wheel-drive system, while providing enhanced traction and stability, adds weight and consumes more fuel than a rear-wheel-drive setup. So, while hitting the EPA’s 30 MPG on the highway is achievable with a light foot, expect slightly lower numbers if you frequently tap into the engine’s reserves.

How it compares

The fuel economy of the CLS450 4matic is competitive within its segment. The BMW 840i xDrive Gran Coupe, a direct competitor, achieves a similar 25 MPG combined. The Audi A7 55 TFSI quattro also hovers around the 25MPG mark. The Porsche Panamera, while offering higher performance trims, begins at around 22 MPG combined for its base model. These comparisons matter to the CLS buyer because they showcase that the Mercedes offers competitive efficiency without sacrificing the performance and luxury expected in this class. Someone browsing CLS450 MPG across all years might also cross-shop these models.

Tips to maximize efficiency

Use the available drive modes to your advantage. The “Eco” mode will remap the throttle response and shift points to prioritize fuel conservation. While it might slightly dampen the engine’s responsiveness, it can make a noticeable difference on long highway drives or in stop-and-go traffic.

Pay attention to tire pressure. Underinflated tires increase rolling resistance, which forces the engine to work harder and burn more fuel. Check your tire pressure regularly and maintain it at the recommended levels, usually found on a sticker inside the driver’s side door jamb.

Avoid aggressive acceleration and hard braking. The CLS450’s engine is powerful, but using that power excessively will significantly impact fuel economy. Smooth, gradual acceleration and gentle braking are key to maximizing efficiency. Anticipate traffic flow and maintain a consistent speed whenever possible.

Minimize idling time. If you know you’ll be stopped for more than a minute, turn off the engine. Modern cars are designed to restart quickly and efficiently, and idling wastes fuel unnecessarily. The mild-hybrid system in the CLS450 helps in this area by offering a smoother stop/start experience than many competitors.

Remember that the 4matic all-wheel-drive system is active full-time. While it offers superior grip in all conditions, it’s also drawing power constantly. Those primarily concerned with lower fuel costs might consider a rear-wheel-drive alternative, but the all-wheel-drive is integral to the CLS450’s character as a confident all-weather performer. For all Mercedes Benz fuel economy data, you can continue browsing FuelEconomyHub.com.