The 2019 Mercedes-Benz SLC300 achieves a combined fuel economy rating of 27 MPG, an acceptable figure for a stylish two-seat roadster that prioritizes driving enjoyment. This isn’t a commuter car; it’s designed for weekend trips. People who buy an SLC300 aren’t usually considering a Prius; they’re drawn to the Mercedes-Benz brand, the open-air driving experience, and the responsive nature of a well-engineered sports car. Fuel economy is a consideration, but not the most important one.

City and highway performance

The EPA estimates the SLC300 gets 23 MPG in the city and 32 MPG on the highway. The city figure reflects typical stop-and-go driving, while the highway number shows the 9-speed automatic transmission’s ability to maintain low engine RPMs at cruising speeds. The engine’s strong torque means less downshifting on the highway, which helps optimize fuel consumption. Owners typically find these fuel economy values realistic if driving responsibly. Driving hard will cause the MPG to drop quickly, as is to be expected when enjoying its power.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2019 Mercedes-Benz SLC300 at $2,150. This is based on driving 15,000 miles per year and using national average fuel prices. It’s a good benchmark for comparing costs with other vehicles, but your actual expenses will depend on your driving habits and local fuel costs. This number is important to consider when determining if you can afford a car like this, because the total cost including insurance and maintenance can be high, which is a factor for the typical owner of an SLC300.

Real-world expectations

While the EPA provides a standardized estimate, real-world fuel economy often varies. Driving style, traffic, and even tire pressure can affect your MPG. Owners who accelerate smoothly and maintain consistent speeds are more likely to match or exceed the EPA estimates. However, those who drive aggressively or spend a lot of time in city traffic may see lower numbers. Understanding these factors is essential for managing fuel costs and getting the most out of your SLC300.

How it compares

The SLC300’s fuel economy is competitive for a roadster. The BMW Z4 sDrive30i, also with a 2.0L turbocharged engine, gets slightly better fuel economy at 28 MPG combined. The Porsche 718 Boxster (2.0L) also achieves 27 MPG combined similar to the SLC300’s number, but produces 300 HP from the same engine size. The Audi TT Roadster, with its 2.0L turbo, achieves about 26 MPG combined.

Choosing between these cars usually depends on looks, brand preference, and driving feel, rather than a difference of a few MPG. If you want an overview of all Mercedes Benz fuel economy data this would be a good place to start. If you want a more focused view, you can research SLC300 MPG across all years. The SLC300 offers comfort and ease of use, while the Porsche focuses more on performance.

Tips to maximize efficiency

The 9-speed automatic transmission in the SLC300 helps fuel economy. Let it upshift early and avoid accelerating too quickly. The transmission is designed to keep the engine in its most efficient range.

Make sure your tires are properly inflated. Underinflated tires increase rolling resistance, which makes the engine work harder and waste fuel. Check your tire pressure regularly and inflate them to the recommended levels, usually found on a sticker inside the driver’s side door.

Reduce unnecessary weight in the car. Extra cargo increases the load on the engine and hurts fuel economy. Remove anything from the car that you don’t need, freeing up space and improving efficiency. Weight matters, especially in a small roadster.

Plan your routes to avoid traffic. Stop-and-go driving uses more fuel than maintaining a steady speed. Use navigation apps to find congested areas and choose different routes, even if they are a bit longer. Cruising is much more efficient than crawling.