20 MPG combined: for the 2024 Porsche 911 Carrera 4S Cabriolet, it’s a data point, not a deal-breaker. Let’s be honest. No one buys a convertible all-wheel-drive 911 for its fuel sipping capabilities. This is a vehicle purchased for its performance, its heritage, and the sheer joy of open-air motoring, and with those priorities, 20 MPG is simply the cost of entry into an exclusive and exhilarating club.

City and highway performance

The EPA estimates the 2024 Porsche 911 Carrera 4S Cabriolet at 18 MPG in the city and 23 MPG on the highway. The relatively minor drop in city driving indicates a well-tuned engine and efficient stop/start system, which helps mitigate the fuel consumption inherent in urban environments. While 23 MPG on the highway isn’t groundbreaking, the 3.0L twin-turbocharged flat-six engine delivers effortless power even at cruising speeds, meaning less throttle input and therefore better efficiency than you might expect from a car with this performance envelope. The eight-speed dual-clutch automatic transmission (AM-S8) also certainly has a significant effect on this figure, keeping the engine in its peak efficiency range when possible and making the most out of every drop of fuel.

Annual fuel cost

According to the EPA, the annual fuel cost for the 2024 Porsche 911 Carrera 4S Cabriolet is $2,900. This figure is based on driving 15,000 miles per year and using national average fuel prices, in reality, premium fuel prices and your personal driving style will likely result in a higher figure. Keep in mind that a 911 owner is likely less concerned with fluctuating gas prices and more focused on the driving experience and maintenance.

Real-world expectations

While the EPA estimates provide a baseline, real-world fuel economy for the 2024 911 Carrera 4S Cabriolet will vary considerably based on driving style and conditions. A lead foot and frequent bursts of acceleration will undoubtedly lower the MPG, while gentle throttle inputs and highway cruising can yield figures closer to, or even slightly above, the EPA’s estimate. The topography of your driving environment also plays a factor; hilly terrain will force the engine to work harder, reducing fuel economy. Factor in roughly 10-15% lower than advertised if you intend to frequently use the car as Porsche engineers intended.

How it compares

Compared to other high-performance sports cars, the 2024 911 Carrera 4S Cabriolet’s fuel economy is relatively competitive. The Mercedes-AMG SL 55, another convertible with all-wheel drive and comparable performance, achieves a combined 18 MPG. The BMW M4 Competition Convertible, with its inline-six engine, manages around 19 MPG combined, close, but still slightly behind the 911. Even the less powerful Chevrolet Corvette Stingray Convertible, with its V8 engine, only achieves a combined 19 MPG. These slight differences may not be crucial for the target demographic but are certainly enough to give the Porsche a slight edge in some buyers’ minds. See 911 MPG across all years for more information.

Tips to maximize efficiency

The 911 responds well to smooth driving. Avoid aggressive acceleration and braking, as these habits significantly impact fuel consumption. Instead, focus on maintaining a steady speed and anticipating traffic flow to minimize unnecessary stops and starts. Using cruise control on the highway can also help maintain a consistent speed and optimize fuel economy.

Ensure your tires are properly inflated to the recommended pressure, which is typically found on a sticker inside the driver’s side door or in the owner’s manual. Underinflated tires increase rolling resistance, forcing the engine to work harder and reducing fuel efficiency. While you’re at it, be sure to use the correct high-octane fuel as specified by Porsche, running lower octane fuel can damage your engine over time, negating any potential cost savings.

Consider using the Porsche’s driving modes to your advantage. The “Normal” mode optimizes the engine and transmission for fuel efficiency, while the “Sport” and “Sport Plus” modes prioritize performance. Use “Normal” mode for everyday driving and switch to a sportier mode only when you want to experience the car’s full potential. The car will be more than happy in these situations and make the most efficient use of the selected performance profile.

Keep your 911 properly maintained. Regular oil changes, air filter replacements, and spark plug inspections are important for optimal engine performance and fuel efficiency. A well-maintained engine runs smoother and more efficiently than one that is neglected. Refer to your owner’s manual for the recommended maintenance schedule and be sure to check all Porsche fuel economy data.