20 MPG combined won’t win any awards for less gas, but it’s also not the main concern for someone sliding behind the wheel of a 2020 Porsche 911 Carrera 4 Cabriolet. This car is bought for its visceral driving experience, its iconic silhouette, and the sheer thrill of open-air motoring, all while retaining the all-weather confidence of all-wheel drive. Fuel efficiency is less important, but it’s still a factor to consider for ongoing ownership costs.

City and highway performance

The EPA estimates for the 2020 911 Carrera 4 Cabriolet equipped with the 3.0L twin-turbo six-cylinder engine and the 8-speed PDK automatic transmission are 18 MPG in the city and 24 MPG on the highway. The difference between city and highway figures reflects the engine’s behavior under different driving conditions. Stop-and-go traffic hurts fuel economy, while steady highway cruising allows the engine to operate more efficiently. The all-wheel-drive system, while providing added traction, also contributes to a slight fuel economy penalty compared to the rear-wheel-drive Carrera models. Ultimately, the 911 rewards deliberate driving with better-than-expected fuel economy, while aggressive acceleration and constant gear changes will rapidly push consumption upwards.

Annual fuel cost

According to the EPA, the estimated annual fuel cost for the 2020 Porsche 911 Carrera 4 Cabriolet is $2,900. This calculation is based on driving 15,000 miles per year and using national average fuel prices. Individual spending will vary depending on driving habits and the price of premium gasoline in your area. Drivers with a heavier foot and those who predominantly drive in congested city environments should expect to exceed this figure, while owners who primarily use the car for weekend cruises might see a lower annual fuel bill. The $2,900 figure provides a solid baseline for budgeting purposes.

Real-world expectations

The EPA estimates provide a standardized benchmark, but real-world fuel economy can vary significantly. 911 owners are known to enjoy the car’s performance, and spirited driving will inevitably lead to lower MPG figures. Note that the 911’s engine requires premium fuel, which is often more expensive than regular gasoline.

Those planning extended road trips might find that highway MPG approaches or even slightly exceeds the EPA estimate, but consistent city driving, especially in sportier drive modes that keep the engine in its power band, will pull the average down.

How it compares

Compared to other high-performance convertibles, the 2020 911 Carrera 4 Cabriolet’s fuel economy is neither exceptional nor particularly poor. The BMW M4 Convertible, for instance, achieves a similar 19 MPG combined with its inline-six engine. The Mercedes-AMG C63 S Cabriolet, with its powerful V8, manages only around 18 MPG combined, emphasizing the fuel consumption penalty of larger displacement engines. Even electrified competitors like the Polestar 6 roadster show the benefit of added electric motors with a higher economy rating. For drivers prioritizing open-top thrills over ultimate efficiency, you can find all Porsche fuel economy data in comparison charts throughout our site. For granular details on previous iterations read more about 911 MPG across all years in our comparison guides.

Tips to maximize efficiency

Use the 911’s Eco mode when appropriate. This mode adjusts the engine and transmission settings to prioritize fuel efficiency. It might slightly dampen throttle response, but it can make a noticeable difference in MPG during everyday driving, especially on the highway during longer trips.

Pay attention to tire pressure. Properly inflated tires reduce rolling resistance, leading to improved fuel economy. Regularly check your tire pressure and inflate them to the recommended levels specified on the doorjamb sticker. This is a simple but effective way to save fuel and improve handling.

Avoid aggressive acceleration and braking. The 911’s twin-turbo engine is responsive, but launching from every stoplight will dramatically decrease fuel efficiency. Gentle acceleration and anticipatory braking not only conserve fuel but also contribute to a smoother and more enjoyable driving experience.

Minimize idling. Letting your car idle for extended periods wastes fuel. If you’re stopped for more than a minute or two, turn off the engine. The 911’s modern starting system ensures a quick and effortless restart.

Service the vehicle regularly. Keeping the engine properly maintained is important when trying to maximize fuel efficiency. Something as simple as replacing old spark plugs or air filters keeps the vehicle performing optimally.