The 2024 Mercedes-Benz AMG SL63 4matic Plus achieves 16 MPG combined. The SL63 is made to deliver strong performance and a luxurious open-air experience, and fuel consumption is a consequence for its target audience.

City and highway performance

The SL63’s EPA ratings break down to 14 MPG in the city and 21 MPG on the highway. The disparity is not surprising. The hand-built 4.0L twin-turbo V8, producing a monstrous 577 horsepower, requires fuel, particularly in stop-and-go conditions where the engine is constantly accelerating this substantial roadster. Out on the open road, with the 9-speed automatic transmission settled into higher gears and the turbos breathing easily, 21 MPG is achievable, though still hardly economical.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2024 Mercedes-Benz AMG SL63 4matic Plus at $3,600. This figure is based on driving 15,000 miles per year and using national average fuel prices for premium gasoline, which this high-performance engine requires. Buyers considering a six-figure roadster are likely less concerned about this expense than about the raw performance and prestige the SL63 delivers. Even so, it’s a significant sum that prospective owners should factor into the overall cost of ownership.

Real-world expectations

While the EPA provides a standardized benchmark, real-world fuel economy for the SL63 will vary widely depending on driving style and conditions. Frequent hard accelerations, spirited cornering, and heavy traffic can easily drag the MPG figure below the already low EPA estimates. Conversely, a careful driver who spends more time on the highway might be able to approach, or even slightly exceed, the 21 MPG highway rating. However, given the intoxicating performance on offer, resisting the urge to unleash the V8’s fury will be a constant challenge.

How it compares

Competitors in the high-performance roadster segment often fall into a similar fuel economy range. The Porsche 911 Turbo S Cabriolet, for example, achieves a slightly better, but still unimpressive, 17 MPG combined. A BMW M8 Competition Convertible lands around 17 MPG combined as well. The Jaguar F-Type R Convertible manages around 18 MPG, which is still only a slight improvement. The subtle differences matter less than the fact that all these vehicles prioritize power and driver engagement over outright fuel sipping. Buyers cross-shopping these cars understand this tradeoff and are prioritizing performance above all else.

Tips to maximize efficiency

While the SL63 isn’t designed for hypermiling, there are still steps owners can take to improve fuel economy within reasonable limits. Ensure the tires are properly inflated to the recommended pressure. Underinflated tires increase rolling resistance and reduce fuel efficiency, and on a performance car like this, correct tire pressure is critical to handling and safety.

Smooth acceleration and braking are essential for conserving fuel in any vehicle, but particularly crucial for a high-horsepower car like the SL63. Avoid aggressive launches and hard braking; instead, anticipate traffic conditions and maintain a steady pace whenever possible. This will also improve the lifespan of the premium brakes.

Use the car’s driving modes appropriately. The SL63 offers various modes that adjust engine and transmission settings. Selecting “Comfort” or “Eco” modes, if available, will typically soften throttle response and encourage earlier upshifts, leading to improved fuel economy compared to more aggressive settings like “Sport” or “Sport+.” Of course, this contradicts the general nature of this car, and the reason people buy it, but these drive modes *do* have an effect.

Consider shorter trips for purely recreational driving. The SL63 is ideal for a weekend jaunt or afternoon cruise and is engineered for spirited driving. These cars are an indulgence, which is why you can find all Mercedes Benz fuel economy data ranging from hyper-efficient 4-cylinder commuter vehicles to monsters like this SL 63. Keeping routine errand running separate from your high-performance driving keeps your mind right, and keeps the gallons-per-mile under control.

Regular maintenance is non-negotiable. A properly maintained engine will always operate more efficiently. Follow the manufacturer’s recommended service schedule, including oil changes, air filter replacements, and spark plug inspections. Neglecting these basic tasks can negatively impact fuel economy and overall performance. You can explore AMG MPG across all years to compare relative performance of models and powertrains.