The 2020 Mercedes-Benz S560 Convertible, with its strong twin-turbo 4.0L V8, achieves an EPA-estimated 20 MPG combined. Let’s be clear: nobody buying this open-top flagship is primarily concerned with fuel consumption. This car represents the height of Mercedes-Benz luxury, performance, and prestige. The 20 MPG figure isn’t a selling point, but rather an accepted cost of entry into a world of sublime comfort and effortless power. It’s a fair trade-off for the symphony of the V8 and the wind in your hair.

City and highway performance

The S560 Convertible manages 17 MPG in the city and 26 MPG on the highway. The city figure reflects the realities of stop-and-go driving, where the car’s weight and the engine’s displacement become factors. On the open road, the 9-speed automatic transmission allows the engine to cruise at relatively low RPMs, contributing to the more respectable highway number. While those seeking ultimate efficiency might shudder, remember that S-Class Convertible buyers are looking for performance and refinement first, and prioritize fuel costs significantly further down the list. This is a car built for smooth grand touring, and the highway MPG allows for genuinely enjoyable long journeys.

Annual fuel cost

The EPA estimates that the annual fuel cost for the 2020 Mercedes-Benz S560 Convertible is $2,900. This figure is calculated based on driving 15,000 miles per year, using the national average fuel price. Of course, fuel prices fluctuate constantly, and individual driving habits can significantly impact fuel consumption. Someone who spends most of their time in heavy city traffic will likely exceed that $2,900 estimate, while those who primarily use the car for relaxed highway cruising might find themselves below it. Ultimately, anyone who can afford a six-figure convertible isn’t likely to be overly concerned about a few hundred dollars difference in annual fuel costs.

Real-world expectations

While the EPA provides a useful benchmark, real-world MPG often varies. Expect to see figures close to the EPA estimates if you drive with a light foot and prioritize smooth acceleration and gentle braking. However, the temptation to unleash the S560’s V8 is ever-present and frequent bursts of acceleration will inevitably decrease fuel economy. Driving style, road conditions, and even tire pressure can all influence your MPG. Keep in mind that the premium unleaded fuel requirement also adds to the overall running costs.

How it compares

The S560 Convertible exists in a rarefied segment where outright efficiency isn’t the primary concern. However, it’s still useful to have some context. Consider the Bentley Continental GT Convertible, another ultra-luxury open-top option. With its W12 engine, it achieves a combined EPA rating of just 15 MPG. Even the V8-powered Continental GT Convertible comes in at around 18 MPG combined. The BMW 8 Series Convertible, while sportier than the S560, boasts slightly better fuel economy at around 20-22 MPG combined for its various engine options. The S560′s fuel consumption is therefore largely comparable to its direct competitors, and its price reflects that. For those interested, you can find all Mercedes Benz fuel economy data at our Mercedes hub. You can also view S560 MPG across all years.

Tips to maximize efficiency

Given that S560 Convertible owners aren’t hypermilers, the focus here isn’t on squeezing every last drop of fuel, but rather on making responsible choices that have a meaningful impact.

Gentle acceleration and anticipation of traffic flow are key. The S560’s abundant torque means you don’t need to bury the throttle to maintain pace. Smooth and progressive inputs will keep the engine in its most efficient operating range, reducing fuel consumption substantially.

Ensure your tires are properly inflated to the recommended pressure. Underinflated tires increase rolling resistance, forcing the engine to work harder and use more fuel. Maintaining correct tire pressure also improves handling and extends tire life.

Minimize unnecessary weight in the car. Extra cargo adds to the vehicle’s overall mass, which requires more energy to accelerate and maintain speed. Empty the trunk of any non-essential items.

Consider using the car’s driving modes. Select the “Comfort” or “Eco” mode for everyday driving. While in Comfort mode this S560 prioritizes fuel saving over aggressive acceleration, Eco mode further calibrates acceleration and shift points to enhance efficiency by actively changing the vehicle dynamics.