18 MPG combined. Let’s be frank: nobody buys a 2018 Mercedes-Benz AMG GLC63 S Coupe expecting Prius-level fuel efficiency. This unapologetic performance machine exists to deliver exhilarating speed and a spine-tingling exhaust note, and for owners who prioritize those thrills, the fuel bill is simply part of the experience. It’s a cost of admission to the world of handcrafted AMG power, all-wheel-drive grip, and head-turning style. You buy this specific model because you want the most aggressive, the most powerful, and the most aurally satisfying GLC Coupe possible, and fuel economy is a distant consideration.

City and highway performance

The EPA estimates 15 MPG in the city and 22 MPG on the highway for the GLC63 S Coupe. The city figure reflects the stop-and-go conditions where the twin-turbo V8 is constantly working to overcome the vehicle’s mass, while the highway number is more representative of steady-state cruising. Engaging the “Comfort” drive mode and feathering the throttle will certainly improve these figures, but let’s be real, the temptation to unleash the engine’s full potential is always present, and that, of course, takes a toll.

Annual fuel cost

According to the EPA, the estimated annual fuel cost for the 2018 Mercedes-Benz AMG GLC63 S Coupe is $3,200. This calculation is based on driving 15,000 miles per year, with 45% of those miles driven in the city and 55% on the highway, using national average fuel prices. Keep in mind that premium fuel is required for this engine, which further contributes to the higher running costs. For owners contemplating all Mercedes Benz fuel economy data, it is important to factor this into the overall ownership costs.

Real-world expectations

While the EPA numbers provide a baseline, real-world fuel economy will vary considerably based on driving style and conditions. Frequent hard acceleration, extended idling, and navigating congested city streets will push fuel consumption well below the EPA estimates. Conversely, disciplined highway driving with minimal speed fluctuations might yield slightly better results. But again, the very nature of this vehicle encourages spirited driving, making it difficult to consistently achieve the advertised fuel economy. Assume you’ll be visiting the gas station more often than those driving a standard GLC.

How it compares

The BMW X4 M Competition, a direct rival, offers similar performance and fuel economy, hovering around 16 MPG combined. The Porsche Macan Turbo, while offering slightly better handling prowess, comes in at around 19 MPG combined. Even the “lesser” AMG GLC43 Coupe manages only 20 MPG combined. For a more detailed look at AMG MPG across all years, resources exist to help you compare and contrast.

Tips to maximize efficiency

While outright fuel efficiency is not the GLC63 S Coupe’s forte, there are a few strategies to minimize fuel consumption. Selecting the “Comfort” drive mode softens throttle response and optimizes shift points for efficiency, but ultimately dulls the driving experience. More moderate acceleration and anticipating traffic flow can also make a small difference.

Ensure the tires are properly inflated to the manufacturer’s recommended pressure. Underinflated tires increase rolling resistance and negatively impact fuel economy. This is especially important on a performance vehicle where tire pressures can fluctuate depending on driving intensity.

Avoid extended idling whenever possible. Modern engines are designed to be shut off and restarted without significant wear. If you’re stopped for more than a minute or two, turning off the engine can save a noticeable amount of fuel over time.

Consider using cruise control on long highway drives. Maintaining a consistent speed minimizes speed fluctuations and helps the engine operate more efficiently. This is particularly effective on relatively flat terrain.