20 MPG combined. The 2018 Mercedes-Benz AMG GLC43 delivers that. It’s a figure that might raise eyebrows in a world increasingly focused on efficiency, but to understand it, you have to understand the mission of the GLC43. This isn’t your neighbor’s sensible GLC300; this is an AMG, a machine designed to blend luxury with genuine performance and to provide an engaging driving experience that many are willing to pay a premium for. Fuel economy takes a back seat, but it remains a factor for the buyer considering this specific blend of practicality and athleticism.

City and highway performance

The EPA estimates for the GLC43 break down to 18 MPG in the city and 24 MPG on the highway. The city figure reflects the stop-and-go nature of urban driving, where the potent twin-turbo V6 is constantly tasked with getting the relatively heavy crossover moving. Highway driving, with its more consistent speeds, allows the 9-speed automatic transmission to stretch its legs, allowing the engine to cruise at lower RPMs for slightly better fuel efficiency. However, even on the highway, enthusiastic use of the throttle, a common urge with this car, will bring that number down quickly. Ultimately, your driving style plays a major role in achieving, or failing to achieve, these EPA estimates.

Annual fuel cost

The EPA factors in these MPG estimates to calculate an annual fuel cost of $2,900. This figure is based on driving 15,000 miles per year and using national average fuel prices. While the official calculation considers that the GLC43 uses premium fuel, it remains an estimate. Your actual fuel costs will depend greatly on how many miles you drive each year, where you drive (city vs. highway), where you live (fuel prices vary greatly state-to-state), and, perhaps most significantly, your driving habits. Aggressive acceleration and frequent hard braking will dramatically increase your fuel consumption, pushing that $2,900 figure even higher.

Real-world expectations

Owners of the 2018 AMG GLC43 generally report numbers close to the EPA estimates, but often slightly lower, particularly in combined driving. You can expect to see figures closer to 17-19 MPG in mixed conditions if you regularly enjoy the car’s performance capabilities. Some drivers focused on maximizing fuel economy might manage to hit the EPA numbers consistently, but that likely involves sacrificing some of the driving enjoyment the AMG is known for. The reality is that most buyers of this vehicle aren’t primarily concerned with squeezing every last mile out of each gallon of fuel, and they are willing to accept the trade-offs for the performance and luxury that the GLC43 offers.

How it compares

Compared to its competitors, the GLC43’s fuel economy slots it into a defined category. For example, the 2018 Audi SQ5, another performance-oriented SUV, achieves a slightly better combined MPG of 21. The BMW X3 M40i of the same year mirrors the Audi’s numbers, also reporting 21 MPG combined using a similar turbocharged six-cylinder engine. Conversely, some larger or more powerful options like the Porsche Macan Turbo typically achieve similar or slightly lower figures, around 19 MPG combined. These MPG differences might seem small at first glance, but they can add up over time, especially with the GLC43 requiring premium fuel. Those interested in all Mercedes Benz fuel economy data can dive deeper into these comparisons.

Tips to maximize efficiency

Be gentle with the accelerator. The GLC43’s twin-turbo V6 is responsive, and it’s easy to dip deeply into the throttle. However, doing so will dramatically reduce your fuel economy. Focus on smooth, gradual acceleration to keep the turbochargers from constantly spooling up and consuming extra fuel.

Take advantage of the transmission’s many gears. The 9-speed automatic is designed to keep the engine in its most efficient RPM range. Allow it to do its job by avoiding aggressive downshifts and letting it upshift early when possible. Using cruise control on the highway can also help in maintaining a steady speed and maximizing fuel efficiency.

Keep your tires properly inflated. Underinflated tires increase rolling resistance, which forces the engine to work harder and consume more fuel. Check your tire pressure regularly and ensure they are inflated to the manufacturer’s recommended settings, typically found on a sticker inside the driver’s side door jamb.

Reduce unnecessary weight. Carrying extra cargo adds weight to the vehicle, which also increases fuel consumption. Remove any unnecessary items from the trunk or cargo area to lighten the load and improve efficiency. Also, consider removing roof racks when you aren’t actively using them.

Consider your drive mode. The AMG GLC43 likely features different driving modes (Comfort, Sport, Eco, etc.). Experiment with these modes to see if one suits your daily driving style without sacrificing too much performance. Selecting a less aggressive driving mode will often soften throttle response and optimize shift points for better fuel efficiency. More details on AMG MPG across all years can be found here.