18 MPG combined is the reality for anyone considering a 2019 Mercedes-Benz AMG S63 4matic Convertible. Let’s be clear: nobody cross-shopping this hand-built, twin-turbo V8 droptop is prioritizing trips to the fuel pump. They’re prioritizing how quickly they can reach 60 mph (around 3.5 seconds), how glorious the exhaust note sounds with the top down, and how many envious glances they can attract along the way. Fuel efficiency is, at best, an afterthought.

City and highway performance

The EPA estimates this S63 will achieve 15 MPG in city driving and 24 MPG on the highway. These figures are derived from a standardized testing procedure that simulates typical driving conditions. The city test involves stop-and-go traffic and lower speeds, while the highway test focuses on consistent speeds more representative of open-road cruising. The 9-speed automatic transmission certainly helps on the highway, keeping the engine in its sweet spot, but the sheer power on tap means fuel consumption rises quickly with any aggressive throttle input. This is a car designed to be enjoyed, not babied, and that enjoyment comes at a predictable price.

Annual fuel cost

The EPA calculates the annual fuel cost for the 2019 Mercedes-Benz AMG S63 4matic Convertible to be $3,200. This figure is based on driving 15,000 miles per year and using the national average fuel price. Obviously, this number will fluctuate depending on your driving habits and the prevailing cost of premium gasoline (which is the only acceptable fuel for this AMG). Those who frequently exploit the car’s performance capabilities should expect to exceed this estimate, while those who primarily use it for leisurely cruising might see a slightly lower annual cost.

Real-world expectations

While EPA ratings provide a useful baseline, real-world MPG will invariably vary. The S63’s prodigious power output and the temptation to unleash it mean many owners will likely see figures below both the city and combined estimates. The car’s weight, advanced all-wheel-drive system, and the inherent inefficiency of a large displacement, high-performance engine all contribute to fuel consumption. The S63 is often used for shorter, spirited drives around town, where fuel consumption will be much higher than a long, steady highway trip. Those considering this car should factor in the likelihood of spending more on fuel than the EPA suggests.

How it compares

Compared to other high-performance luxury convertibles, the S63’s fuel economy is typical. The BMW M850i xDrive Convertible, offering slightly less power, manages around 17 MPG city and 25 MPG highway. A Porsche 911 Turbo S Cabriolet, substantially lighter and more focused, achieves approximately 15 MPG city and 20 MPG highway. These figures demonstrate that even engineering and advanced technologies cannot entirely overcome the laws of physics when chasing extreme performance. For those interested in a broader range of options, all Mercedes Benz fuel economy data is readily available, including AMG MPG across all years.

Tips to maximize efficiency

While outright fuel efficiency isn’t the primary concern for most S63 owners, there are still strategies to reduce fuel consumption and help keep costs in check.

Gentle acceleration is key. The twin-turbo V8 is incredibly responsive, but aggressive throttle inputs dramatically increase fuel consumption. Try to anticipate traffic flow and maintain a smoother, more consistent speed whenever possible.

Engage “Comfort” mode. The S63 offers multiple driving modes that alter throttle response, suspension stiffness, and transmission behavior. “Comfort” mode prioritizes fuel efficiency by softening throttle inputs and promoting earlier upshifts.

Ensure proper tire inflation. Underinflated tires increase rolling resistance, which in turn reduces fuel economy. Regularly check your tire pressures and maintain them at the recommended levels. also consider that wider, stickier performance tires (often fitted to this car) will typically reduce fuel economy compared to narrower, all-season tires.

Avoid unnecessary idling. Letting the engine idle for extended periods wastes fuel. If you anticipate being stopped for more than a minute or two, turn off the engine.