22 MPG combined is not the reason anyone buys a 2016 Mercedes-Benz AMG SLK55. Let’s be honest: buyers in the market for a hand-built, naturally aspirated V8 roadster are chasing thrills, not low fuel consumption. This is a car that prioritizes a visceral driving experience and a thunderous exhaust note over squeezing every possible mile from a gallon of premium fuel.

City and highway performance

The SLK55’s EPA ratings break down to 19 MPG in the city and a more respectable 28 MPG on the highway. The city figure reflects stop-and-go driving coupled with the temptation to frequently dip into the V8’s power. The highway number, while better, still isn’t exceptional, primarily due to the engine’s displacement. Even with a 7-speed automatic, it’s geared more for rapid acceleration than ultimate cruising efficiency. Expect the engine to be turning over at a fairly healthy RPM even at highway speeds.

Annual fuel cost

The EPA estimates an annual fuel cost of $2,650 for the 2016 Mercedes-Benz AMG SLK55, based on driving 15,000 miles per year, assuming a consistent mix of city and highway driving, and using national average fuel prices. Consider this number a baseline. Drivers who frequently indulge in spirited driving, as the SLK55 encourages, will likely see a higher annual fuel expenditure. Keep in mind this calculation also depends on using premium gasoline, which is mandatory for optimal performance and longevity in this high-performance engine.

Real-world expectations

Real-world fuel economy for the SLK55 will heavily depend on driving style. Those who spend most of their time in urban environments and enjoy exploiting the V8’s power will likely see numbers closer to, or even slightly below, the 19 MPG city rating.

On longer highway trips, especially if driven with a lighter foot, it’s possible to achieve or even slightly exceed the 28 MPG highway figure. However, understand that this car is designed for enjoyment, and that translates to fewer miles per gallon. Don’t expect hybrid-like numbers; embrace the V8 experience and budget accordingly. Check out AMG MPG across all years to see the fuel economy trajectory of this performance brand.

How it compares

The SLK55 lives in a niche occupied by few competitors. Consider the BMW Z4 M40i. Its turbocharged inline-six boasts comparable performance but offers better fuel economy, typically achieving around 25 MPG combined. Another potential rival, although one with a completely different character, could be the Porsche 718 Boxster. Even the Boxster S, with its turbocharged flat-four, delivers notably better MPG, around 24 MPG combined. The Audi TTS, with its turbocharged four-cylinder and all-wheel drive, also excels, hitting approximately 26 MPG combined. The truth is, those shopping the SLK55 are usually less concerned with fuel economy and more focused on the visceral appeal of a classic, naturally aspirated V8 in a compact roadster. For those buyers, a few MPG points are a negligible price to pay for the unique driving experience.

Tips to maximize efficiency

Despite its performance-oriented nature, there are ways to improve the SLK55’s fuel consumption. Practice smooth acceleration and avoid aggressive throttle inputs. The V8 may be eager to unleash its power, but gentle acceleration minimizes fuel wasted during rapid acceleration. Mastering the art of anticipatory driving, looking ahead and avoiding unnecessary braking, can also contribute noticeably to improved MPG.

While the SLK55 offers various driving modes, including an “Eco” mode, its impact on fuel economy is relatively modest compared to the effect of your driving habits. However, select “Eco” when cruising at steady speeds on the highway. It remaps the transmission and throttle response to prioritize efficiency. Ensure that your tires are properly inflated. Low tire pressure increases rolling resistance, which reduces fuel economy. Check and maintain the recommended tire pressure regularly, as specified on the door jamb or in the owner’s manual. Also, see all Mercedes Benz fuel economy data.

Minimize unnecessary weight in the car. Extra cargo adds to the vehicle’s overall mass, requiring more energy to accelerate and maintain speed. Remove any items you don’t need for your daily drive, keeping only essential items in the trunk. Adhering to the recommended service schedule is also critical. A properly maintained engine runs more efficiently, which directly impacts fuel economy. Regular oil changes, air filter replacements, and spark plug maintenance all contribute to optimal engine performance and fuel efficiency.