21 MPG combined is not a headline figure for the 2019 Mercedes-Benz AMG C63 S. In fact, it’s probably the last thing on the mind of anyone considering this snarling, twin-turbocharged V8-powered performance sedan. It’s a trade-off, an accepted reality for those who prioritize raw power, aggressive styling, and spine-tingling exhaust notes over hyper-efficiency. This car isn’t about saving fuel; it’s about experiencing driving thrills, and the fuel consumption reflects that mission.

City and highway performance

The EPA estimates the AMG C63 S achieves 18 MPG in the city and 27 MPG on the highway. The city figure reflects the reality of stop-and-go traffic, where the massive 4.0L V8 is constantly working to get the substantial sedan moving. The highway MPG, while better, speaks more to controlled bursts of acceleration for passing rather than sustained fuel-sipping cruising; the engine’s immense power reserve is always on tap, tempting drivers to dip into the throttle.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2019 Mercedes-Benz AMG C63 S at $2,750. This figure is calculated 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. Of course, the actual cost will vary depending on individual driving habits and local fuel prices. However, $2,750 gives potential buyers a realistic benchmark for budgeting the cost of ownership of such a high-performance machine.

Real-world expectations

Real-world fuel economy for the C63 S often mirrors the EPA estimates if the driver shows restraint. Let’s be honest: few C63 S owners drive with fuel economy in mind. The temptation to unleash the horsepower and feel the car’s explosive acceleration is ever-present. Expect to see figures closer to the city rating if you frequently exploit the car’s performance capabilities. A lead foot will quickly drop the average, while a conscious effort to drive more conservatively, especially on the highway, could yield slightly better results.

How it compares

Compared to its competitors, the AMG C63 S’s fuel economy paints a revealing picture. The BMW M3 Competition, with its inline-six engine, manages a slightly better 20 MPG city and 26 MPG highway. The Audi RS5 Sportback, featuring a turbocharged V6, boasts 18 MPG city and 29 MPG highway. While the differences may seem small on paper, over the course of a year, they can add up. The M3 Competition buyer might prioritize a slightly sharper driving experience while gaining a small fuel economy benefit. The RS5’s buyer may value its different body style and similar performance with slightly better highway efficiency. But these buyers are all in the same general category, willing to accept less-than-stellar fuel economy for a focused, high-performance machine. The availability of all Mercedes Benz fuel economy data helps informed buyers compare and contrast performance figures. And don’t forget to explore AMG MPG across all years to put each model into the most appropriate context.

Tips to maximize efficiency

While the AMG C63 S isn’t designed for ultimate fuel efficiency, there are a few strategies to minimize consumption. Avoid excessive idling, particularly when the engine is cold. The engine consumes more fuel during the warm-up phase, so getting moving sooner rather than later prevents unnecessary waste.

Use the car’s drive modes intelligently. Comfort mode will soften the throttle response and encourage earlier upshifts, which can improve fuel economy in everyday driving. While it dampens the car’s aggressive character, it will help save fuel when you’re not looking to set lap records.

Maintain proper tire inflation. Underinflated tires create more rolling resistance, forcing the engine to work harder and burn more fuel. Regularly check your tire pressures and inflate them to the recommended levels specified on the sticker inside the driver’s side door jamb.

Anticipate traffic flow and practice smooth driving techniques. Avoid sudden acceleration and braking, as these actions waste fuel. Maintaining a steady speed and allowing the car to coast when possible reduces the engine’s workload.