17 MPG combined: that’s what you get for entry into a very exclusive club. The 2021 Mercedes-Benz AMG S63 4matic Plus Convertible isn’t bought for its good fuel consumption; it’s bought for the sheer thrill of a hand-built AMG V8 launching you down the road with the top down. The people who buy this car are high-net-worth individuals for whom the cost of fuel is likely a rounding error on their monthly expenses. They prioritize performance, luxury, and exclusivity above all else. Any discussion of MPG needs to be viewed from that perspective.

City and highway performance

The EPA estimates show the AMG S63 convertible gets 14 MPG in the city and 24 MPG on the highway. The city figure reflects stop-and-go driving, where the powerful V8 spends a lot of time idling or accelerating from a standstill. The highway rating, while better, is still modest due to the aerodynamic challenges of a convertible and the engine’s inherent thirst, even with the 9-speed automatic transmission working to keep the revs relatively low at cruising speed. These figures underscore the car’s performance-biased design. Fuel efficiency is a secondary consideration.

Annual fuel cost

According to the EPA, the annual fuel cost for running a 2021 Mercedes-Benz AMG S63 4matic Plus Convertible will be around $3,400. This calculation is based on driving 15,000 miles per year, with approximately 55% of those miles driven in the city and 45% on the highway, using national average fuel prices. Given the S63’s requirement for premium fuel, this figure is not insignificant, but for its target demographic, it’s a manageable expense within the broader context of ownership costs.

Real-world expectations

While the EPA figures provide a baseline, real-world fuel economy for the AMG S63 convertible will likely vary depending on driving style and conditions. Drivers who frequently use the car’s impressive power will almost certainly see lower MPG numbers. Conversely, those who drive more calmly on the highway might achieve figures closer to, or even slightly above, the EPA estimate. However, it’s safe to assume that the average S63 owner isn’t focused on saving fuel, and the temptation to unleash that V8 will inevitably affect their MPG.

How it compares

Compared to other high-performance convertibles, the AMG S63’s fuel economy is about what you’d expect. For instance, a BMW M850i Convertible typically achieves around 17 MPG combined, while an Aston Martin DB11 Volante, with its V8 engine, achieves closer to 18 MPG combined. A Porsche 911 Turbo S Cabriolet can achieve 17MPG combined. For those seeking better economy, all Mercedes Benz fuel economy data reveals the EQS sedan offers significantly improved electric range.

Performance usually outweighs better fuel economy. The S63 prioritizes raw power and luxurious features.

Tips to maximize efficiency

Even though fuel economy might not be the main concern for S63 owners, there are still some things you can do to improve it. Avoid aggressive acceleration and hard braking, as these driving habits really impact fuel consumption. Use the car’s driving modes. Selecting the “Comfort” mode will reduce throttle response and encourage earlier upshifts, which can slightly improve fuel efficiency during everyday driving. Regular maintenance, including tire inflation and engine tune-ups, can also contribute to better MPG.

Minimize idling time. The AMG S63’s engine consumes a considerable amount of fuel even when it’s sitting still. If you’re stopped for more than a minute or two, turn off the engine to conserve fuel. While the start-stop system is designed to do this automatically, you can manually activate it by pressing the eco start/stop in the center console. Keep in mind these systems do not work with the air conditioning system blasting.

Plan your routes carefully. Avoiding congested areas and opting for routes with consistent speeds can help maintain better MPG. Use the navigation system to find the most efficient routes and minimize stop-and-go traffic. Also, plan trips for off-peak hours to avoid traffic jams.

Finally, consider the weight you’re carrying. Removing unnecessary items from the trunk and passenger compartment can reduce the vehicle’s overall weight and improve fuel efficiency. While the impact may be small, every little bit helps. Consider using the AMG as a 2-seater rather than hauling friends about town.

The 2021 Mercedes-AMG S63 4Matic+ Convertible’s mission is clear: deliver thrilling performance encased in handcrafted luxury. Factors like AMG MPG across all years will matter little to those who seek the ultimate in open-top grand touring.