22 MPG combined is acceptable for the 2024 Mercedes-Benz AMG SL43. To be clear, nobody buys an AMG SL primarily for fuel efficiency. The SL43 is built to deliver open-air thrills, strong performance, and unmistakable style. This MPG is the price of admission, and many drivers considering it are willing to pay it.

City and highway performance

The EPA estimates for the SL43 are 20 MPG in the city and 27 MPG on the highway. The city figure reflects stop-and-go conditions where the engine’s efficiency is lower, and the car’s weight becomes a factor. The highway MPG showcases the benefits of the 9-speed automatic transmission, which allows the engine to cruise at lower RPMs, conserving fuel. These figures are typical for performance cars, whose buyers often prioritize acceleration times over saving money at the pump.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2024 Mercedes-Benz AMG SL43 at $2,650. This is based on driving 15,000 miles per year, with 45% of those miles driven in the city and 55% on the highway. The calculation also uses the national average fuel prices at the time of the estimate, and it’s important to remember that those prices fluctuate. This figure should be viewed as a benchmark to help you understand the SL43’s fuel consumption relative to other vehicles.

Real-world expectations

While the EPA estimates provide a standardized benchmark, expect real-world MPG to vary. More aggressive driving, frequent use of the car’s performance features, and driving predominantly in heavy city traffic will likely result in lower figures. Conversely, consistent highway driving at moderate speeds could yield results closer to, or even slightly better than, the EPA’s 27 MPG estimate. The SL43 is a performance vehicle, and its fuel economy is highly dependent on driving style. This car begs to be driven aggressively. If you’re constantly monitoring MPG, you’re missing the point of owning an AMG SL.

How it compares

Compared to other performance convertibles, the AMG SL43 is competitive. The BMW Z4 M40i, with its more powerful inline-six, gets an EPA-estimated 26 MPG combined, slightly ahead of the SL43. A Porsche 718 Boxster, depending on the engine and options, lands in a similar range. The base Boxster achieves 24 MPG combined. But the SL43 boasts a higher level of luxury and technology that will sway some buyers. Those shopping for a true grand tourer might also consider the Lexus LC 500 Convertible. With its naturally aspirated V8, it is rated at just 18 MPG combined. The difference in annual fuel cost between the SL43 and the LC 500 is significant; however, for some buyers, the sound and feel of a V8 are worth it.

Tips to maximize efficiency

Although the 2024 Mercedes-Benz AMG SL43 is not primarily designed for fuel efficiency, adopting some sensible driving habits can help maximize MPG. Gentle acceleration and anticipating traffic flow will minimize unnecessary fuel consumption. The SL43’s nine-speed automatic transmission is programmed for efficiency, so allow it to shift smoothly and avoid aggressive downshifts unless needed for performance.

Ensure that the tires are properly inflated to the recommended pressure. Underinflated tires increase rolling resistance, which negatively impacts fuel economy. Check your tire pressures regularly, especially during significant temperature changes.

Reduce unnecessary weight in the vehicle. Extra cargo in the trunk or rear seats adds to the burden on the engine, decreasing fuel efficiency. Keep the vehicle as light as possible to optimize MPG.

Take advantage of the car’s driving modes. Select “Comfort” mode for everyday driving to optimize fuel efficiency. This mode will adjust throttle response and transmission mapping to prioritize economy over outright performance. Selecting a sportier mode will drastically decrease the fuel economy, as the engine will sit at a higher RPM. It is best left to short bursts of enthusiastic driving.

Consider the maintenance schedule. Regular maintenance, including oil changes, air filter replacements, and spark plug inspections, ensures that the engine is running efficiently. Following the recommended service intervals can help prevent issues that might negatively impact fuel consumption.

Find all Mercedes Benz fuel economy data. See AMG MPG across all years.