Achieving 23 MPG combined is part of owning the 2020 Mercedes-Benz AMG SLC43. This isn’t a vehicle focused on fuel efficiency; it’s a stylish and potent roadster for fun drives and top-down enjoyment. Buyers know the hand-built AMG engine uses more fuel, and they’re willing to trade MPGs for the performance and exclusive experience this car offers. It’s a weekend car, a style choice, and a performance machine in one package.

City and highway performance

The EPA estimates of 20 MPG in the city and 29 MPG on the highway show the AMG SLC43’s fuel consumption. The city figure, while not terrible, reflects a powerful engine accelerating and navigating traffic. The highway number improves because the 9-speed automatic transmission can cruise efficiently. Even on the highway, aggressive driving will reduce those gains since the 3.0L V6 bi-turbo encourages drivers to use its power.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2020 Mercedes-Benz AMG SLC43 at $2,500. This is based on driving 15,000 miles per year, using the national average price for premium gasoline (which this car needs). This gives potential owners a benchmark, but individual driving habits and fuel prices will change this number. If you spend more time on weekend drives or in stop-and-go traffic, expect a higher fuel bill. Performance car buyers should factor in this cost, especially if they plan to drive the car hard, not just commute.

Real-world expectations

EPA estimates offer a standard comparison, but real-world fuel economy for the AMG SLC43 changes based on driving style, traffic, and weather. Owners who frequently use the engine’s full power for acceleration and cornering will likely see numbers closer to the city estimate, or even lower. However, those who mainly drive on the highway and accelerate gently might get figures closer to, or slightly above, the EPA’s highway rating. Expect around the combined MPG figure, knowing that performance driving uses more fuel.

How it compares

The 2020 AMG SLC43’s fuel economy is average for the roadster segment. The Porsche 718 Boxster gets around 24 MPG combined in its base form, slightly better than the AMG SLC43, but the sportier versions can easily drop below that number. The BMW Z4 M40i, with its inline-six engine, gets around 25 MPG combined. These differences add up. If fuel economy across Mercedes Benz is important, research all Mercedes Benz fuel economy data, and these cars have different power and features, making MPG just one factor in buying. Review the AMG MPG across all years.

Tips to maximize efficiency

The AMG SLC43 isn’t about fuel efficiency, but you can minimize fuel use without losing driving fun. Avoid fast acceleration and hard braking, and accelerate and brake smoothly. The bi-turbo V6 uses more fuel when it’s boosting.

Use the car’s driving modes. “Comfort” mode will optimize throttle and shift points for less gas. “Sport” and “Sport+” modes offer performance improvements, but will increase fuel consumption.

Keep tires properly inflated. Underinflated tires increase rolling resistance, decreasing fuel economy. Check your tire pressure often and inflate them to the recommended levels shown on the door jamb sticker.

Regular maintenance helps fuel efficiency. Keep the engine tuned, replace air filters as recommended, and use the recommended grade of premium fuel. A well-maintained engine runs more efficiently, saving money on gas.