The 2015 Mercedes-Benz C350 Coupe, with its 3.5L V6, gets a combined fuel economy of 23 MPG. Buyers in this segment understand this is not the most frugal choice. This car is a statement of individual style and driving pleasure, where a naturally aspirated six-cylinder delivers a more visceral experience than most hybrids.

City and highway performance

The EPA estimates the C350 Coupe will get 20 MPG in the city. This reflects the realities of stop-and-go traffic, where the engine’s eager nature and the transmission’s responsiveness can lead to more frequent fuel consumption. On the open road, the C350 Coupe gets a more respectable 28 MPG. This is partly due to the seven-speed automatic transmission, which allows the engine to cruise at lower RPMs at highway speeds, reducing fuel consumption. This also shows this well-engineered gasoline engine is inherently efficient when it isn’t constantly accelerating.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2015 Mercedes-Benz C350 Coupe at $2,500. This figure assumes 15,000 miles driven per year, with fuel prices based on national averages. It’s a useful benchmark for comparing running costs to other vehicles, but individual expenses could vary significantly depending on driving habits and local fuel prices. Aggressive driving and premium fuel requirements could easily push that number higher.

Real-world expectations

While the EPA numbers provide a baseline, the C350 Coupe’s real-world fuel economy often falls slightly below those figures. Owners report combined MPG figures closer to 21 or 22, especially with frequent city driving. The car’s responsiveness and the engine’s sound encourage spirited driving. The 3.5L V6 requires premium fuel, adding to the overall running costs. Anyone interested should check C350 MPG across all years to see other model years.

How it compares

Compared to its contemporaries, the C350 Coupe’s fuel economy is within the expected range for a sporty coupe with a naturally aspirated six-cylinder engine. The BMW 428i Coupe from the same year, with its turbocharged four-cylinder engine, achieves a slightly better 27 MPG combined. However, the Audi A5 2.0T, another popular choice, offers a similarly rated 25 MPG combined. For buyers prioritizing a smooth, linear power delivery and the distinct sound of a V6, the modest fuel economy trade-off of the C350 Coupe is likely worthwhile.

Tips to maximize efficiency

Keep your tires at the recommended pressure. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. This is critical on a car like the C350 Coupe, where even a small decrease in efficiency can impact your wallet.

Avoid aggressive acceleration and braking. The C350 Coupe performs well, but frequent, hard acceleration and braking dramatically reduce fuel economy. Aim for smooth, gradual inputs to maximize efficiency. The transmission is optimized for both performance and efficiency, so let it do its job.

Minimize idling. Letting the engine idle wastes fuel. If you anticipate being stopped for more than a minute, turn off the engine. Modern cars warm up quickly while driving, so there’s no need to “warm up” the engine before driving.

Regular maintenance is key. Ensure that your C350 Coupe is regularly maintained according to the manufacturer’s recommendations. This includes oil changes, air filter replacements, and spark plug replacements. A well-maintained engine operates more efficiently and consumes less fuel.

Consider eco mode. Mercedes-Benz offers an “Eco” driving mode, which alters the throttle response and shift points to prioritize fuel efficiency. Using this mode can help you achieve better fuel economy in everyday driving conditions. However, using Eco mode can make the C350 feel sluggish, but is a simple tap of a button away from the V6’s full potential.

The 2015 Mercedes-Benz C350 coupe provides the sound and driving feel of a naturally aspirated V6 engine that is rare. Buyers can explore all Mercedes Benz fuel economy data if they want a more modern engine technology.