20 MPG combined comes with owning the 2021 Mercedes-Benz S560 Convertible. This car isn’t chosen for its economy, but for the experience of open-air luxury combined with strong V8 power. This vehicle is purchased by people who appreciate handcrafted luxury and the thrill of a twin-turbocharged engine, and they recognize that efficiency is sacrificed to get it.

City and highway performance

The EPA estimates clearly show the S560 Convertible’s strengths and weaknesses. The 16 MPG city rating shows the engine’s large displacement and the vehicle’s weight. Stop-and-go traffic and short trips keep the engine from reaching its best operating temperature, which increases fuel consumption. However, the 26 MPG highway rating shows the benefits of the smooth-shifting 9-speed automatic transmission, which allows the engine to cruise at low RPMs, maximizing efficiency on long journeys. The transmission’s tall gearing, combined with the engine’s abundant torque, makes highway passing easy and surprisingly economical.

Annual Fuel Cost

According to the EPA, the estimated annual fuel cost for the 2021 Mercedes-Benz S560 Convertible is $2,900. This is based on driving 15,000 miles per year, with 45% of those miles driven in the city and 55% on the highway, using the national average fuel price. Remember that fuel costs can change based on location and driving habits. And, the S560 Convertible requires premium fuel, which costs more than regular gasoline, adding to the annual expense.

Real-World Expectations

EPA estimates provide a baseline, but real-world fuel economy depends on driving style and conditions. Someone who frequently uses the S560 Convertible’s power, exploring its 463 horsepower and 516 lb-ft of torque, will likely see numbers below the EPA estimates. However, a driver who adopts a more relaxed style, anticipates traffic flow, and avoids aggressive acceleration can potentially match or even slightly exceed the EPA’s highway rating. Remember that factors like tire pressure, vehicle maintenance, and the use of accessories like air conditioning also impact fuel efficiency.

How it compares

The S560 Convertible is in a unique market, but comparisons to other luxury convertibles are inevitable. The BMW M850i Convertible, with its own twin-turbo V8, achieves an EPA-estimated 17 MPG city and 25 MPG highway. The Porsche 911 Carrera S Cabriolet fares a bit better, offering around 18 MPG city and 25 MPG highway with its turbocharged flat-six engine. Audi’s R8 Spyder, with its naturally aspirated V10, comes in at 13 MPG city and 20 MPG highway. These numbers highlight the S560’s competitive position: Not the most efficient in its class, but certainly not the worst, striking a balance between performance and fuel consumption that appeals to its target clientele. Prospective buyers can compare this data to S560 MPG across all years to understand trends.

Tips to maximize efficiency

While the S560 Convertible prioritizes performance and luxury, owners can take measures to improve its fuel economy. Gentle acceleration is key. The twin-turbo V8 responds readily to even light throttle inputs, so avoid unnecessary bursts of speed that consume excess fuel. Allow the engine to warm up properly before demanding maximum performance. Cold starts are particularly fuel-inefficient, so a few minutes of gentle driving helps the engine reach its best operating temperature.

Monitor tire pressure regularly. Underinflated tires increase rolling resistance, which forces the engine to work harder and reduces fuel economy. Consult the label on the driver’s side doorjamb for the recommended tire pressure and check it at least once a month. Proper tire inflation not only improves fuel efficiency but also enhances handling and extends tire life.

Minimize unnecessary weight by removing any items from the trunk or passenger compartment that you don’t need. Extra weight burdens the engine and reduces fuel efficiency. This is especially important on the S560 Convertible, which already carries a significant curb weight.

Use the transmission’s Eco mode, if equipped. This mode alters the engine and transmission mapping to prioritize fuel efficiency over performance. While it may slightly reduce throttle response, it can help improve fuel economy in everyday driving situations and all all Mercedes Benz fuel economy data is rated under specific conditions, and deviation from these conditions greatly impacts MPG.