20 MPG combined isn’t what Porsche 911 Carrera S Cabriolet buyers care about most. This isn’t a car purchased for maximizing fuel efficiency; it’s about open-top thrills, blistering acceleration, and the inimitable flat-six engine sound. The focus is purely on driving pleasure, and 20 MPG becomes almost an afterthought.

City and highway performance

The EPA estimates the 911 Carrera S Cabriolet gets 18 MPG in the city and 23 MPG on the highway. Understanding these figures means acknowledging how this car is typically driven. City driving in a 911 often involves stop-and-go traffic where the engine’s potential is significantly hampered. The powerful 3.0L turbocharged flat-six and the quick-shifting 8-speed automatic (AM-S8) transmission aren’t optimized in these conditions.

On the open road, the car can stretch its legs, offering slightly better efficiency as it settles into a more relaxed cruising speed. The temptation to exploit the car’s immense power is ever-present, which will lower the highway economy rating.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2022 Porsche 911 Carrera S Cabriolet at $2,900. This figure is calculated based on driving 15,000 miles per year, using a national average fuel price. Remember that Porsche recommends premium fuel, which typically costs more than regular gasoline. This cost can change significantly based on current fuel prices and individual driving habits. Those who frequently drive hard will likely see their annual fuel expenses exceed this estimate.

Real-world expectations

Real-world fuel economy for the 911 Carrera S Cabriolet typically matches the EPA estimates, but variation depends on driving style. Drivers who prioritize performance and frequently use the car’s acceleration will likely see figures closer to the city rating, or even slightly lower. But drivers who stick to highway cruising at moderate speeds may see numbers closer to, or slightly exceeding, the 23 MPG highway estimate. Fuel economy is secondary for most 911 owners; however, understanding these real-world variations can help manage expectations.

How it compares

The 911 Carrera S Cabriolet is unique compared to its competitors. The BMW M4 Competition Convertible offers similar performance with an EPA-estimated 16 MPG city, 23 MPG highway, and 19 MPG combined. A Mercedes-AMG C63 S Cabriolet, known for its V8 power, posts even lower numbers, around 17 combined MPG. Fuel economy can vary even among other 911 variants. For example, the all-wheel-drive 911 Carrera 4S Cabriolet achieves similar fuel economy which can be found at 911 MPG across all years. These comparisons show the 911 isn’t the most efficient sports car, but it isn’t the worst either. It’s a balance between performance and acceptable fuel consumption, a compromise most buyers are willing to make. Detailed information on all Porsche fuel economy data can help you compare different models.

Tips to maximize efficiency

Use the car’s driving modes. Selecting “Normal” mode eases throttle response and optimizes the transmission for fuel efficiency. It tempers the car’s sporting character, but it can make a noticeable difference on longer, less spirited drives.

Avoid aggressive acceleration and heavy braking. Smooth inputs are key to maximizing fuel economy in any vehicle, and the 911 is no exception. Anticipating traffic flow and maintaining a consistent speed can significantly improve economy.

Make sure the tires are properly inflated. Regularly check and maintain the recommended tire pressure. Under-inflated tires increase rolling resistance, hurting fuel economy. Refer to the sticker on the driver’s side doorjamb for the correct pressure specifications.

Minimize idling. Modern engines consume fuel even when stationary. If you anticipate being stopped for more than a minute or two, turn off the engine to save fuel and reduce emissions.