20 MPG combined is a compromise for the 2021 Mercedes-Benz AMG GLC43 4matic; it’s a calculated one. It’s the price you pay for legitimate AMG performance in a compact SUV. Buyers of this model aren’t as concerned with saving every drop of premium unleaded, they want rapid acceleration, a sporty exhaust, and the Mercedes star on the hood.

City and highway performance

The EPA estimates the AMG GLC43 gets 18 MPG in the city and 24 MPG on the highway. The city number reflects the inefficiency of stop-and-go driving, where the 3.0L turbocharged V6 works to overcome inertia. The highway number, while better, still lags behind more fuel-focused competitors. The AMG’s tuning is a factor, as the engine focuses on power over economy, and the 9-speed automatic transmission is calibrated for quick shifts, impacting efficiency. The standard 4MATIC all-wheel drive also makes the MPG slightly lower than front-wheel-drive vehicles.

Annual fuel cost

The EPA calculates an annual fuel cost of $2,900 for the 2021 Mercedes-Benz AMG GLC43. This is based on driving 15,000 miles per year and using the national average fuel price for premium gasoline. It’s a standardized way to compare fuel expenses across different vehicles, letting potential owners factor in the cost of ownership beyond the purchase price. While the $2,900 is a benchmark, individual fuel costs will vary depending on driving habits, local fuel prices, and the type of driving (city versus highway).

Real-world expectations

While the EPA provides an estimate, real-world MPG for the AMG GLC43 can vary. Aggressive driving, frequent hard acceleration, and city driving will likely result in fuel economy below the EPA estimates. On the other hand, consistent highway cruising at moderate speeds might get better results. Ambient temperature, tire pressure, and even using accessories like air conditioning can also influence fuel consumption. Drivers who often select the AMG’s sportier driving modes should expect the MPG to drop due to the more aggressive engine and transmission settings.

How it compares

Compared to other performance compact SUVs, the AMG GLC43’s fuel economy is in the middle. The Porsche Macan S, with its 3.0L V6, delivers about 19 MPG combined, which is virtually identical. A BMW X3 M40i, with a turbocharged inline-six, gets around 23 MPG combined, a slight advantage. The Audi SQ5, with its 3.0L TFSI engine, lands around 21 MPG combined. These small differences can add up over a year. The AMG offers more engine tuning and a sportier exhaust. If you’re researching all Mercedes Benz fuel economy data, you’ll notice the AMG models emphasize performance over efficiency.

Tips to maximize efficiency

Use the ECO driving mode when you can. The AMG GLC43 has driving modes that change the throttle, transmission, and even steering. ECO mode focuses on efficiency by softening the throttle and encouraging early upshifts, reducing fuel use during driving.

Keep your tires inflated. Underinflated tires increase rolling resistance, making the engine work harder and use more gas. Check your tire pressures and inflate them to the levels on the doorjamb sticker. This can improve MPG.

Anticipate traffic. Avoiding sudden acceleration and braking is important for fuel efficiency. By anticipating traffic and maintaining a smooth speed, you can reduce fuel use. Leaving space between you and the car in front allows for smoother deceleration.

Minimize idling. Idling uses gas without moving. If you’re waiting for more than a minute, turn off the engine. Modern engines are designed to be restarted often without wear or fuel issues.

Consider how performance enhancements affect your MPG. Aftermarket modifications like larger wheels or performance exhausts can hurt fuel economy. These changes often add weight, change aerodynamics, or lead to more aggressive driving. For a sense of AMG MPG across all years, compare models and generations.