27 MPG combined is a respectable figure for the 2017 Mercedes-Benz SLC300. No one buys this car *primarily* for gas savings. The SLC300 is a statement, a two-door roadster designed to turn heads as much as it is to transport you. This is a car for enjoying a sunny weekend, not for saving every last drop of fuel on the interstate. Its fuel economy is a compromise, a footnote on a vehicle that prioritizes style and open-air thrills over outright efficiency.

City and highway performance

The EPA estimates for the 2017 SLC300 break down to 25 MPG in the city and 32 MPG on the highway. The city number reflects stop-and-go traffic, where the 2.0L turbocharged four-cylinder engine is working harder to accelerate. The highway figure, however, showcases the engine’s ability to cruise efficiently. The smooth-shifting nine-speed automatic transmission contributes to the highway efficiency, keeping the engine at an efficient RPM.

Annual fuel cost

The EPA estimates an annual fuel cost of $2,150 for the 2017 Mercedes-Benz SLC300. This is based on driving 15,000 miles per year and using national average fuel prices. This is just an estimate. Your actual fuel costs will vary depending on your driving habits, the type of roads you drive on, and local fuel prices. More aggressive driving will quickly push that $2,150 figure upward.

Real-world expectations

The EPA estimates provide a good baseline, your actual fuel economy will likely vary. Factors like driving style, terrain, and even tire pressure can influence your MPG. Drivers who frequently enjoy spirited acceleration or live in hilly areas may find their MPG closer to the low 20s. Those who prioritize smooth, consistent driving on flat terrain could potentially exceed the EPA estimates. The 2017 SLC300 doesn’t feature any selectable drive modes that specifically enhance fuel efficiency, so managing consumption is up to the driver.

How it compares

The SLC300’s fuel economy is competitive. The BMW Z4 sDrive30i, in comparable model years, achieves around 28 MPG combined. The Audi TT Roadster offers around 26 MPG combined, while the Porsche 718 Boxster delivers a respectable 24 MPG combined. These figures demonstrate that the SLC300 holds its own against its primary rivals. For more insight, check out SLC300 MPG across all years.

Tips to maximize efficiency

Anticipate traffic flow and avoid sudden acceleration and braking. The SLC300’s responsive engine can be tempting, but smooth inputs will significantly improve your fuel economy. Treat the throttle carefully, especially in city driving, and let the nine-speed automatic transmission do its job efficiently.

Ensure your tires are properly inflated. Underinflated tires increase rolling resistance, which forces the engine to work harder. Check your tire pressure regularly, ideally before each drive, and inflate them to the pressure recommended on the sticker inside the driver’s side door.

Minimize excess weight. Carrying unnecessary items in the trunk adds weight to the vehicle, which reduces fuel economy. Remove any items you don’t need, and be especially mindful of carrying heavy items like golf clubs or luggage on short day trips.

Consider your route. If possible, choose routes with fewer stoplights and less congested traffic. Avoiding stop-and-go traffic will keep the engine operating more efficiently. Even small changes in your commute can add up to savings.

Service the vehicle on time. Keeping your SLC300 properly maintained is critical for optimal fuel economy. This includes regular oil changes, air filter replacements, and spark plug replacements. A well-maintained engine runs more efficiently. For a broader perspective, explore all Mercedes Benz fuel economy data.