20 MPG combined is the figure that hangs over the 2018 Mercedes-Benz AMG GLC43 4matic Coupe like a stylish, if slightly inconvenient, accessory. This isn’t the fuel economy you should look for if your primary goal is minimizing trips to the pump. This is the fuel economy you accept as the price of entry into a world of snarling exhaust notes, rapid acceleration, and a silhouette that prioritizes aesthetics over aerodynamic efficiency.

City and highway performance

The EPA estimates the GLC43 Coupe achieves 18 MPG in the city and 24 MPG on the highway. These numbers reflect a driving cycle designed to represent typical conditions, but they don’t tell the whole story. The city figure, while not stellar, is understandable given the stop-and-go nature of urban environments and the GLC43’s eagerness to launch from every green light. The highway MPG, however, can feel a bit optimistic. While achievable with a gentle right foot, exploiting the car’s performance potential, merging aggressively or overtaking slower traffic, will quickly see that number plummet. It’s a car that encourages enthusiastic driving, and that enthusiasm comes at a cost.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2018 Mercedes-Benz AMG GLC43 4matic Coupe at $2,900. This figure is based on driving 15,000 miles per year and using national average fuel prices. Of course, your actual fuel cost will vary depending on your driving habits, the type of gas you use (premium is recommended for optimal performance), and local fuel prices. If you’re regularly dipping into the AMG’s performance reserves, expect to exceed that $2,900 figure considerably. Conversely, more restrained drivers who spend most of their time on the highway might get closer to the estimate, or even slightly better.

Real-world expectations

Forget hypermiling. This is an AMG, and its owners are buying a specific type of driving experience. Expect to see real-world fuel economy hovering around 17-21 MPG in mixed driving. Short trips around town will drag that average down, while longer highway journeys, driven with restraint, might push it slightly higher. The GLC43’s 9-speed automatic transmission is generally smooth and efficient, but the temptation to use the paddle shifters and hold gears longer, maximizing the throaty exhaust note, will invariably impact your fuel consumption. The car’s 4MATIC all-wheel-drive system, while providing confident grip in all conditions, also contributes to the slightly higher fuel consumption compared to a rear-wheel-drive alternative.

How it compares

The GLC43 Coupe exists in a segment where performance and style often trump outright fuel efficiency. The BMW X4 M40i, a direct competitor, offers similar performance with comparable fuel economy, rated at 21 MPG combined. The Porsche Macan S, another stylish SUV coupe, delivers around 19 MPG combined, sacrificing a bit of efficiency for even sharper handling. Moving outside the coupe segment, the Audi SQ5, a more traditionally shaped SUV, achieves around 21 MPG combined. Buyers considering the AMG GLC43 Coupe are consciously choosing a car that prioritizes engaging driving dynamics and striking design over maximizing every last mile per gallon. They are likely cross-shopping these cars for their performance characteristics, and they accept the fuel economy compromises that come along with the package. Check AMG MPG across all years to see if you can save money on past model years.

Tips to maximize efficiency

While the GLC43 Coupe isn’t designed for economy, there are still ways to minimize your fuel consumption. Drive smoothly and avoid aggressive acceleration or braking. The 3.0L V6 is responsive even with gentle throttle inputs, negating the need to bury the pedal to the floor for routine tasks.

Use the “Comfort” driving mode whenever possible. While the “Sport” and “Sport+” modes sharpen throttle response and hold gears longer, the “Comfort” mode optimizes the transmission for fuel efficiency, allowing it to shift more quickly into higher gears.

Ensure your tires are properly inflated. Under-inflated tires increase rolling resistance, which in turn reduces fuel economy. Check your tire pressure regularly and maintain the recommended levels as indicated on the door jamb.

Consider using cruise control on long highway drives. Maintaining a constant speed helps to minimize unnecessary acceleration and deceleration, leading to improved fuel efficiency. Be mindful of varying terrain, as cruise control can sometimes downshift aggressively on inclines, negating some of the benefits.

Regular maintenance is critical for optimal fuel economy. Ensure your GLC43 Coupe receives regular oil changes, air filter replacements, and spark plug maintenance, as recommended in the owner’s manual. A well-maintained engine operates more efficiently, leading to improved fuel consumption. For all Mercedes Benz fuel economy data, see our main listing.