20 MPG combined isn’t the main reason someone buys a 2020 Porsche 911 Carrera 4S Cabriolet. It’s the price to pay for experiencing one of the most exhilarating and capable sports cars, one that also offers open-air fun. Owners accept the fuel consumption because they prioritize fast acceleration, sharp handling, and the Porsche brand above all else. They’re buying an experience, not an economy car.

City and highway performance

The EPA estimates the 2020 Porsche 911 Carrera 4S Cabriolet at 18 MPG in the city and 23 MPG on the highway. These numbers reflect the realities of a powerful engine paired with an advanced all-wheel drive system. The city figure is affected by stop-and-go traffic, quick acceleration from stoplights, and the inherent inefficiencies of a powerful engine idling. The highway number, while improved, is still affected by the car’s wide tires and aerodynamic profile, designed for stability at high speeds rather than outright fuel efficiency.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2020 Porsche 911 Carrera 4S Cabriolet at $2,900. This figure is based on driving 15,000 miles per year and using national average fuel prices. Of course, actual costs will vary depending on individual driving habits, local fuel prices, and the type of fuel used. Porsche recommends premium fuel for optimal performance, which can further increase the annual expenditure.

Real-world expectations

While the EPA provides a standardized benchmark, real-world fuel economy in the 2020 911 Carrera 4S Cabriolet can change significantly. Drivers who frequently push the car’s performance will likely see numbers below the EPA estimates. Those who drive more calmly and spend a lot of time on the highway might achieve figures closer to, or even slightly exceeding, the 23 MPG highway rating. Factors such as traffic conditions, weather, and even tire pressure can also influence fuel consumption.

How it compares

Compared to its competitors, the 2020 911 Carrera 4S Cabriolet’s fuel economy is within expectations. The Jaguar F-Type R Convertible, with its supercharged V8, achieves around 18 MPG combined. The BMW M850i xDrive Convertible, while offering similar levels of luxury and performance, manages about 20 MPG combined. Even the less powerful Audi R8 Spyder gets around 17 MPG combined. For buyers in this segment, the slight variations in fuel economy are usually secondary to factors like performance, styling, and brand prestige. You can find all Porsche fuel economy data here.

Tips to maximize efficiency

Minimize aggressive acceleration. The 911’s twin-turbocharged engine is very responsive, but frequent bursts of acceleration increase fuel consumption. Gradual acceleration will improve your MPG without sacrificing the car’s performance.

Maintain optimal tire pressure. Correct tire pressure reduces rolling resistance, which improves fuel economy. Check your tire pressure regularly and inflate to the recommended levels, found on a sticker inside the driver’s side door jamb. Also, wider performance tires tend to reduce fuel economy.

Use the car’s driving modes. The 911 offers various driving modes, including a “Normal” or “Efficiency” mode that optimizes the engine and transmission for fuel economy. Using these modes during everyday driving can make a noticeable difference.

Avoid idling. Modern engines consume fuel even when idling. If you’re stopped for more than a minute, consider turning off the engine, especially in city driving. The starter is designed for frequent restarts.

Service your car regularly. A well-maintained engine is an efficient engine. Follow the manufacturer’s recommended service schedule, including oil changes, air filter replacements, and spark plug replacements. You can also compare 911 MPG across all years.