The 2018 Mercedes-Benz GLC300 4matic Coupe gets 24 MPG combined. Don’t expect Prius-level efficiency; it’s a style-focused crossover with sporting pretensions, not an economy car. This swoopy coupe sacrifices some practicality for its distinctive looks, a trade-off its target audience willingly accepts. Think of the GLC300 Coupe as a luxurious, all-weather companion with just enough fuel economy to avoid feeling guilty. Buyers aren’t prioritizing maximum MPG, but they also aren’t interested in wasting gas. They want the cachet of the Mercedes-Benz brand, the higher driving position, and the security of all-wheel drive, all wrapped in a head-turning package. Fuel cost is secondary to image and driving experience.

City and highway performance

The EPA estimates the 2018 GLC300 4matic Coupe will achieve 22 MPG in the city and 27 MPG on the highway. The city figure reflects the stop-and-go driving that many GLC300 Coupe owners experience daily. The 2.0-liter turbocharged four-cylinder engine, while potent, needs to work harder in urban environments, leading to lower fuel efficiency. Out on the open road, where the engine can cruise more efficiently and the nine-speed automatic transmission can settle into higher gears, the highway MPG figure is more attainable, and even potentially surpassable with careful driving.

The difference between the city and highway estimates underscores the impact of driving style and environment on fuel consumption, demonstrating that even luxury vehicles are sensitive to driving conditions.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2018 Mercedes-Benz GLC300 4matic Coupe at $2,400. This figure is based on driving 15,000 miles per year and using national average fuel prices. Premium unleaded fuel is recommended for the GLC300, so that higher fuel cost is a factor in the annual fuel calculation. This annual fuel cost is a useful benchmark for comparing running costs across different vehicles, assuming similar driving habits and fuel prices. Remember, individual fuel costs can vary depending on your actual mileage, local fuel prices, and driving style.

Real-world expectations

While the EPA estimates provide a baseline, real-world fuel economy for the 2018 GLC300 4matic Coupe can vary. Achieving the EPA’s figures requires consistent driving habits. Aggressive acceleration, frequent hard braking, and extended idling can all reduce fuel efficiency. Terrain also plays a role; driving in hilly areas will generally lower MPG compared to flat, open roads. Owners who prioritize lower fuel costs and adopt a more conservative driving style can likely get closer to the EPA estimates. Those who frequently indulge in the GLC300’s performance potential may see lower numbers.

Checking GLC300 MPG across all years and crowdsourced data from other owners can provide a more realistic expectation based on various driving conditions.

How it compares

The GLC300 4matic Coupe’s fuel economy puts it in a specific position within its competitive set. The BMW X4 xDrive30i, another stylish crossover coupe, achieves similar EPA-estimated numbers of 23 MPG combined. A more upright SUV like the Acura RDX, can achieve slightly better economy with 24 MPG combined. The Audi Q5, particularly models with the 45 TFSI engine, offers comparable fuel efficiency at 25 MPG combined. These comparisons are important for the GLC300 Coupe buyer, who might be willing to sacrifice a mile or two per gallon for the Mercedes’ brand image or specific design elements but still wants to ensure they aren’t drastically overspending on fuel. If a buyer absolutely needed the best MPG in this class, they would choose one of the hybrid versions of the Q5 or X3, but that’s not often the case for the GLC300 Coupe buyer.

Tips to maximize efficiency

The nine-speed automatic transmission in the GLC300 4matic Coupe is designed to optimize fuel efficiency. Let it do its job. Avoid using manual shift mode unless you truly need the extra control, as the computer generally selects the most efficient gear for any given situation. Smooth, gentle acceleration will help keep the turbocharger from spooling up unnecessarily, thus conserving fuel.

Ensure that your tires are properly inflated. Underinflated tires increase rolling resistance, forcing the engine to work harder and decreasing fuel economy. Check your tire pressure regularly, ideally every couple of weeks, and adjust as needed based on the recommended pressure listed on the driver’s side doorjamb. A small investment in a good tire pressure gauge can pay off quickly in fuel savings.

Minimize unnecessary weight in the vehicle. Extra cargo adds load to the engine, reducing fuel efficiency. Regularly remove items you don’t need, especially heavy objects in the trunk. Every little bit helps, and it’s an easy way to improve your MPG without changing your driving habits.

Reduce idling. Modern engines are designed to idle efficiently, but extended periods of idling still consume fuel. If you anticipate being stopped for more than a minute, it’s generally more efficient to turn off the engine. If you live in a colder climate, allow the engine to warm up for only 30 seconds before driving. The catalytic converter warms up more quickly while driving than while idling.

Consider using cruise control on the highway when appropriate. Maintaining a consistent speed can improve fuel economy compared to constantly fluctuating your speed. Be mindful of traffic conditions and road gradients, and disengage cruise control when necessary to maintain safe following distances. Explore all Mercedes Benz fuel economy data if you are considering alternatives.