21 MPG combined isn’t going to win any hypermiling contests, but it accurately reflects what the 2020 Mercedes-Benz AMG GLC43 4matic is all about. This isn’t about sipping fuel; it’s about delivering a strong blend of performance and luxury in a compact SUV. Buyers choosing the GLC43 are prioritizing the AMG experience, the responsive 3.0L V6, the tuned suspension, the aggressive styling, and while fuel economy is a consideration, it’s rarely the deciding factor. They understand that enjoying 385 horsepower has a cost.

City and highway performance

The EPA estimates for the AMG GLC43 break down to 18 MPG in the city and 24 MPG on the highway. The city rating reflects the engine’s need to work harder in stop-and-go traffic, the frequent acceleration bursts, and idling at red lights. The highway figure represents a more consistent cruising speed where the engine can use its 9-speed automatic transmission to stay in the optimal gear for fuel efficiency, though even here, the temptation to exploit the readily available power will invariably reduce the MPG figures. It is important to note that these figures result when premium fuel is used.

Annual fuel cost

The EPA estimates that the 2020 Mercedes-Benz AMG GLC43 4matic will cost $2,750 per year in fuel. This calculation is based on driving 15,000 miles annually and using national average fuel prices. Of course, actual fuel costs can vary significantly depending on driving habits, local fuel prices, and the type of driving performed (city vs. highway). Someone who primarily drives in stop-and-go traffic and enjoys aggressively accelerating will likely exceed this estimate, while those who primarily cruise on the highway may get closer to the stated highway MPG, resulting in a lower annual cost.

Real-world expectations

While the EPA provides a standardized testing methodology, real-world fuel economy often diverges. Aggressive driving habits, including frequent hard acceleration and braking, will negatively impact MPG. Similarly, factors like tire pressure, vehicle maintenance (dirty air filter, old spark plugs), and even the use of accessories like air conditioning can influence fuel consumption. While some drivers may precisely match the EPA figures, many will find their actual MPG to be slightly lower, especially if they frequently tap into the AMG GLC43’s considerable horsepower. If prospective buyers are seeking to achieve maximum fuel economy from their GLC line, they may want to review all Mercedes Benz fuel economy data.

How it compares

The AMG GLC43’s fuel economy sits roughly where you’d expect for a performance-oriented compact SUV. The BMW X3 M40i, another direct competitor, offers a similar driving experience and achieves an EPA-estimated 21 MPG combined. The Porsche Macan S, though more expensive, delivers comparable performance with an EPA-estimated 19 MPG combined. A standard GLC300 achieves a significantly higher 24 MPG combined; that model prioritizes fuel economy over outright performance, making it a different choice for buyers considering the AMG variant. It’s all about trade-offs: buyers accept a lower MPG figure to access the AMG performance and tuning, but drivers interested in AMG can review the AMG MPG across all years.

Tips to maximize efficiency

Avoid aggressive acceleration. The AMG GLC43 has plenty of power, but using it carefully will significantly improve fuel economy. Smooth, gradual acceleration maximizes efficiency and reduces unnecessary fuel consumption, especially around town.

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

Use cruise control on the highway. Maintaining a consistent speed on the highway can optimize fuel efficiency. Cruise control helps prevent unnecessary acceleration and deceleration, leading to smoother fuel consumption. Remember that cruise control only functions effectively at safe speeds.

Reduce unnecessary weight. Carrying excessive cargo in the vehicle adds weight, which reduces fuel economy. Remove any items from the trunk or backseat that are not essential, lightening the load for better efficiency. Even small reductions in weight can cumulatively improve MPG.

Consider using “Comfort” mode when performance isn’t critical. The GLC43’s driving modes influence throttle response and transmission settings. Switching from “Sport+” to “Comfort” mode relaxes the engine and transmission, prioritizing fuel efficiency for daily driving.