While the 2019 Porsche 911 Carrera 4S Cabriolet gets 24 MPG combined, that’s not usually the main selling point. Buyers looking for the best fuel economy usually consider other vehicles, in different segments. This car prioritizes performance, open-top enjoyment, and all-weather traction, all in an iconic design. Fuel consumption might not be the first consideration, but it’s still useful to examine what that 24 MPG means to owners.

City and highway performance

The EPA estimates the 2019 911 Carrera 4S Cabriolet achieves 21 MPG in the city and 28 MPG on the highway. The city MPG reflects typical stop-and-go traffic, where the powerful 3.0L turbocharged six-cylinder engine and responsive seven-speed automatic transmission (AM-S7) are constantly adjusting power output. However, the highway number shows a different side of this Porsche. Cruising at constant speeds, the engine becomes more efficient, proving that performance cars can achieve reasonably economical long-distance mileage, assuming you resist using its considerable power.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2019 Porsche 911 Carrera 4S Cabriolet at $2,400. This is based on driving 15,000 miles per year, with a standard mix of city and highway driving, using the national average fuel price when the calculations were made. Of course, your actual fuel costs will depend on your driving habits, the type of fuel you use, and local gas prices. The $2,400 figure still gives you a point of comparison.

Real-world expectations

The EPA provides standardized testing, but real-world fuel economy often varies from the official numbers. Expect lower MPG with aggressive acceleration, frequent use of Sport mode, or enthusiastic driving. Conversely, gentle acceleration, anticipating traffic, and maximizing highway miles can slightly improve fuel economy. If you mainly drive short distances around town, don’t expect to consistently achieve the EPA’s 24 MPG combined figure. Owners who use the 911 for longer trips and prioritize smooth driving may get close to the official estimates.

How it compares

The 2019 911 Carrera 4S Cabriolet is competitive, compared to other performance convertibles. For instance, the BMW M4 Convertible, with its 3.0L inline-six, gets around 19 MPG combined. The Mercedes-AMG C63 S Cabriolet, with its more powerful 4.0L V8, gets significantly lower MPG, around 18MPG combined. Even the smaller, lighter Porsche 718 Boxster S achieves around 22 MPG combined, demonstrating the 911’s efficient engine and transmission. For drivers who want to compare 911 MPG across all years, there is plenty of historical data online. Buyers in this market are often less concerned with fuel efficiency, focusing instead on the combination of performance, luxury, and brand prestige. If you want better fuel economy within the Porsche lineup, consider reviewing all Porsche fuel economy data to see if another model is a better fit.

Tips to maximize efficiency

Maintain proper tire pressure based on the manufacturer’s specifications. Properly inflated tires reduce rolling resistance, improving fuel economy. Check tire pressures regularly, especially before long drives.

Avoid unnecessary idling. Modern engines, including the 911’s turbocharged engine, burn fuel even when stopped. Turn off the engine if you anticipate being stopped for more than a minute. The 911’s start/stop system can also help in city driving, but you can disable it with a button.

Use cruise control on the highway when possible. Maintaining a constant speed minimizes changes in engine load, leading to better fuel consumption. Watch traffic and avoid overuse in hilly areas, where it could hunt for the right gear.

Select the right driving mode. The 911 offers various modes, including a “Normal” or “Eco” setting (if equipped). Selecting a more fuel-efficient mode will reduce throttle response and optimize shift points. Avoid always driving in Sport or Sport+ mode, unless you want maximum performance.

Reduce aerodynamic drag. Remove unnecessary items from the exterior, such as roof racks or cargo carriers, when not in use. These increase wind resistance, making the engine work harder and burn more fuel.