23 MPG combined isn’t going to win any hypermiling contests, but it’s a perfectly acceptable figure for the 2017 Mercedes-Benz AMG SLC43. This isn’t a car bought for ultimate fuel efficiency; it’s a stylish and potent roadster designed to deliver open-air thrills, and the fuel consumption reflects that priority. Buyers choose the AMG SLC43 for its responsive twin-turbo V6, sharp handling, and overall AMG experience. They’re willing to trade a few MPG points for the exhilarating performance and status this vehicle provides.

City and highway performance

The EPA estimates the AMG SLC43 will return 20 MPG in the city and 29 MPG on the highway. The city figure reflects the engine’s need to work harder in stop-and-go traffic, where the turbochargers might not be fully engaged. The highway number showcases the benefits of the 9-speed automatic transmission, allowing the engine to cruise at lower RPMs, resulting in improved fuel efficiency. While the 29 MPG highway figure is respectable, remember it depends heavily on maintaining a consistent speed and avoiding aggressive acceleration.

Annual fuel cost

The EPA estimates an annual fuel cost of $2,500 for the 2017 Mercedes-Benz AMG SLC43. This figure is based on driving 15,000 miles per year, with 55% of those miles driven in the city and 45% on the highway, using national average fuel prices. Keep in mind that this is just an estimate. Your actual fuel costs could be higher or lower depending on your driving habits, the type of fuel you use, and the current price of gasoline in your area. For instance, if you primarily drive in the city and have a heavy foot, you will likely exceed the $2,500 estimate.

Real-world expectations

While EPA ratings provide a standardized benchmark, real-world fuel economy often varies. AMG vehicles encourage spirited driving, and the SLC43 is no exception. Drivers who frequently use the engine’s power, especially its impressive mid-range torque, should expect to see figures closer to the city rating, perhaps even slightly below. Conversely, those who prioritize smooth acceleration and anticipate traffic flow may achieve numbers closer to, or even exceeding, the highway estimate, particularly on longer trips. And remember that if you want to compare to other years’ AMG MPG across all years, you can find that information here.

How it compares

The AMG SLC43’s fuel economy sits within a specific segment of performance-oriented roadsters. The BMW Z4 M40i, for example, with its 3.0L inline-6, achieves an EPA-estimated 25 MPG combined. A Porsche 718 Boxster with the base 2.0L turbo four-cylinder, depending on trim and transmission, hovers around 24-25 MPG combined. The Audi TTS, with its 2.0L turbo four-cylinder, manages around 26 MPG combined. The AMG SLC43’s figures underscores that there are slightly more efficient choices for those prioritizing fuel economy. However, the slight dip in MPG is often deemed acceptable by buyers who desire the specific blend of AMG performance, luxury, and unique roadster experience that the SLC43 offers. Don’t forget to check all Mercedes Benz fuel economy data for a wider comparison.

Tips to maximize efficiency

Use “Comfort” mode when cruising. The AMG Dynamic Select system allows you to choose different driving modes that affect throttle response, suspension, and other parameters. Selecting “Comfort” mode softens the throttle and optimizes the shift program for efficiency, resulting in less fuel consumption during steady-state driving. Avoid excessive acceleration, especially from a standstill. The twin-turbo V6 in the AMG SLC43 delivers plenty of power, but each burst of acceleration demands extra fuel. Gradual and deliberate acceleration is more fuel-efficient, especially in and around the city.

Monitor tire pressure regularly. Maintaining the correct tire pressure reduces rolling resistance, which can improve fuel economy. Check the sticker on the driver’s side doorjamb for the recommended tire pressure and inflate your tires accordingly, especially before a long road trip. Just a few PSI low can make a difference, and this is an easy maintenance item to overlook.

Minimize unnecessary idling. Modern engines are designed to be efficient even at idle, but prolonged idling still consumes fuel without covering any distance. If you’re stopped for more than a minute or two, consider turning off the engine. This will conserve fuel and reduce emissions, particularly in urban environments. The AMG SLC43 also features an ECO start/stop function that cuts the engine at idle, further reducing fuel consumption. Be aware, though, that the fuel savings from start/stop systems tend to be very low.

Avoid using launch control and “Race” mode on public roads. A trip to the track is one thing, but these modes are engineered for maximum acceleration and lap times, not fuel efficiency. You’ll be well into the single-digit MPG range if you overuse these systems. The vehicle is more than quick enough in “Sport” or “Sport+” even on public roads.