21 MPG combined isn’t going to win any awards for lower fuel costs for the 2020 Mercedes-Benz AMG C63 S. But let’s be frank: if you’re cross-shopping this snarling, handcrafted, V8-powered car, you’re probably not prioritizing trips to Whole Foods or maximizing fuel savings. This car exists to deliver raw, visceral thrills, and for that mission, the MPG figure is merely a footnote in the ownership experience.

City and highway performance

The C63 S isn’t a hypermiler’s dream on city streets, as it achieves an EPA-estimated 18 MPG. Its eager throttle response and the temptation to unleash the V8’s fury at every green light contribute to this figure. On the open highway, the numbers improve considerably, achieving a respectable 27 MPG. The 9-speed automatic transmission certainly helps here, allowing the engine to cruise at lower RPMs when not being pushed. Still, the car’s sporting nature and tendency to encourage spirited driving mean consistent highway efficiency requires conscious effort.

Annual fuel cost

According to the EPA, the annual fuel cost for operating the 2020 Mercedes-Benz AMG C63 S is estimated at $2,750. This is based on driving 15,000 miles per year and using the national average fuel prices. Given its performance, premium fuel requirement, and typical driving enthusiasm, it’s a figure prospective owners should carefully consider. The fuel bill is a direct consequence of the performance on tap.

Real-world expectations

The EPA estimates are a good guide, but real-world figures often deviate. If you live in a congested city and enjoy using the AMG’s power, which is the whole point, expect your mileage to drop below the official 18 MPG city rating. Conversely, if you primarily use the C63 S for longer highway cruises, you might see slightly better than 27 MPG. Consistent, moderate driving is key to approaching the EPA numbers. But remember, buying a car that begs to be driven assertively, and then driving it gently, is arguably missing the point of owning it.

How it compares

The BMW M3 Competition, a direct rival, achieves a slightly better 20 MPG city/26 MPG highway/23 MPG combined. The Audi RS5 Sportback, another competitor, manages 18 MPG city, 26 MPG highway and 21 MPG combined. A Cadillac CT5-V Blackwing with the manual transmission is rated at 13 city, 21 highway, and 15 combined. Although the numbers are just estimates, the C63 S is about in line with its direct competitors. The slightly lower numbers than some competitors for this level of performance are something a prospective owner takes into consideration, because for many, the noise, the power delivery, and the overall experience are more important than a few MPGs.

View all all Mercedes Benz fuel economy data here, including the more efficient models. Compare AMG MPG across all years to see how the C63S stacks up.

Tips to maximize efficiency

The C63 S responds noticeably to driving style. Gentle acceleration and avoiding unnecessary hard braking will improve fuel economy. Using the car’s driving modes and selecting “Comfort” or “Eco” can also help minimize fuel consumption when performance isn’t a priority.

Ensure your tires are properly inflated and that you perform regular maintenance. Underinflated tires increase rolling resistance, leading to reduced MPG. A well-maintained engine runs more efficiently, so stick to service schedules.

Reduce aerodynamic drag whenever possible. Remove roof racks or cargo carriers when not in use, as they increase drag and can significantly affect highway mileage, especially noticeable at higher speeds that the C63S can easily take you to.

Plan your routes carefully to avoid stop-and-go traffic. Constant acceleration and braking consume more fuel than maintaining a steady speed. Consider alternative routes or off-peak travel times to minimize congestion.

Be mindful of the C63 S’s playful nature. It’s easy to get caught up in enjoying the car’s performance, which has a direct impact on fuel consumption. Restraining from aggressive driving will reward you at the pump.