22 MPG combined might raise an eyebrow, but for the 2015 Mercedes-Benz C350 4matic Coupe, it’s an accepted compromise. This isn’t a car designed to hypermile across the country. It’s a stylish, all-weather capable coupe with a smooth V6 that delivers a satisfying blend of performance and luxury. Buyers of the C350 4matic Coupe prioritize that experience over outright fuel efficiency and are willing to pay a premium at the pump.

City and highway performance

The EPA estimates the C350 4matic Coupe at 19 MPG in the city and 27 MPG on the highway. The city figure reflects the engine’s response in stop-and-go traffic, where the 3.5L V6 and 7-speed automatic transmission work harder, especially with the added weight of the 4matic all-wheel-drive system. The highway MPG is more respectable, showcasing the engine’s efficiency at a steady cruise. The 27 MPG highway number is achievable on long road trips, assuming you resist the urge to frequently tap into the engine’s power for passing maneuvers.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2015 Mercedes-Benz C350 4matic Coupe at $2,650. This calculation is based on driving 15,000 miles per year, using a fuel price that represents a national average. Your actual fuel costs may vary significantly depending on your driving habits, the type of fuel you use (premium is recommended for optimal performance), and where you live. States with higher gas taxes will invariably lead to a higher annual fuel expenditure.

Real-world expectations

While the EPA provides a standardized benchmark, real-world MPG for the C350 4matic Coupe often falls slightly below the official figures, particularly in mixed driving conditions. Aggressive driving, frequent short trips, and extended idling will all negatively impact fuel economy. Owners who prioritize smooth acceleration and maintain a consistent speed can expect to get closer to the EPA estimates. Explore C350 MPG across all years to see how the numbers compare across different model years.

How it compares

Compared to other coupes in its class, the 2015 C350 4matic Coupe’s fuel economy is neither exceptional nor disastrous. The BMW 435i xDrive coupe, for instance, offered similar performance and all-wheel drive with an EPA rating of 22 MPG combined, mirroring the C350. Audi’s A5 Quattro, equipped with a turbocharged four-cylinder, managed a slightly better 25 MPG combined. These comparisons highlight the trade-off with the C350: you’re sacrificing a few MPGs for the smoother power delivery and distinctive sound of the V6 engine. For buyers considering fuel economy as a primary factor, exploring all Mercedes Benz fuel economy data might reveal other models with better numbers.

Tips to maximize efficiency

Maintain consistent tire pressure. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Check your tire pressure regularly and inflate them to the manufacturer’s recommended specifications, usually found on a sticker inside the driver’s side doorjamb.

Avoid aggressive acceleration and braking. Jackrabbit starts and hard stops waste fuel. Drive smoothly and anticipate traffic flow to minimize the need for sudden bursts of speed or abrupt braking. This is especially important in city driving, where fuel economy can fluctuate dramatically based on driving style.

Use cruise control on the highway. Maintaining a constant speed with cruise control helps optimize fuel efficiency, particularly on long highway stretches. This reduces the need for constant adjustments to the throttle, leading to smoother and more economical driving.

Minimize idling. Letting your engine idle for extended periods consumes fuel without covering any distance. If you’re going to be stopped for more than a minute, turn off the engine. Modern engines are designed to restart quickly and efficiently, making this a simple way to save fuel.

Keep up with scheduled maintenance. A well-maintained engine runs more efficiently. Follow the manufacturer’s recommended maintenance schedule for oil changes, spark plug replacements, and air filter replacements. A clean air filter, for example, ensures optimal airflow to the engine, improving combustion and fuel economy.