19 MPG combined. That number for the 2025 Porsche 911 Carrera 4 GTS Cabriolet 3.6L 6-cyl isn’t a headline grabber in the world of economy cars, nor should it be. This isn’t a vehicle engineered to sip fuel; it’s a precision instrument designed for driving exhilaration, a rolling sculpture crafted for sensory overload. The combined figure serves as a mere footnote for an owner who prioritizes a flat-six soundtrack, unflappable AWD grip, and the visceral thrill of open-air acceleration. This is a car for the enthusiast who understands that true value lies in the experience, not just the miles per gallon.

City and highway performance

Looking at the specifics, the 2025 911 Carrera 4 GTS Cabriolet delivers 17 MPG in the city and 23 MPG on the highway. The city figure reflects the nature of a high-performance engine, even Porsche’s 3.6L flat-six. Stop-and-go traffic, the inevitable antagonist of fuel efficiency, sees the powerful engine frequently operating outside its most economical rev range. Yet, even here, the car feels remarkably composed. On the highway, the 23 MPG shows Porsche’s engineering prowess, demonstrating that even a vehicle capable of blistering acceleration can achieve respectable figures when cruising. The PDK automatic transmission plays a significant role, with its optimal gear ratios ensuring the engine operates efficiently at sustained speeds. This isn’t a long-distance cruiser you’d choose for its economy credentials, but it’s certainly capable of gobbling up miles with a surprising degree of politeness, especially considering its strong performance. For comparison, you can find 911 MPG across all years on our database.

Annual fuel cost

The EPA estimates an annual fuel cost of $3,050 for the 2025 Porsche 911 Carrera 4 GTS Cabriolet 3.6L 6-cyl. This figure is based on driving 15,000 miles per year at national average fuel prices, a standardized calculation method designed for direct comparison across various vehicle types. For the buyer of a 911 GTS Cabriolet, this number is a negligible fraction of the vehicle’s overall cost of ownership. Owners are typically less concerned with this line item and more focused on the premium fuel requirements and the car’s dynamic capabilities. It’s part of the covenant of high-performance vehicle ownership, an expected expense for the privilege of driving such a machine. For these individuals, the emotional return on investment far outweighs any minor fluctuations in fuel expenditure.

Real-world expectations

In real-world driving, expect the 2025 911 Carrera 4 GTS Cabriolet to largely align with, or slightly dip below, the official EPA combined figure of 19 MPG. The precise outcome depends almost entirely on the driver’s lead foot. This car actively encourages spirited driving; the intoxicating sound of the flat-six, the instantaneous response of the PDK, and the flawless handling dynamics are all engineered to provoke a smile, which often translates to higher fuel consumption. Someone consistently exploring the upper reaches of the tachometer will likely see figures closer to the city rating, or even lower. Conversely, a driver using cruise control on long highway stretches and exercising restraint in urban environments could realistically achieve numbers at or slightly above the 23 MPG highway rating. The car’s power is always on tap, and resisting its allure is the biggest variable in observed efficiency. It demands premium fuel, which contributes to the overall annual cost.

How it compares

Comparing the 2025 911 Carrera 4 GTS Cabriolet’s fuel economy requires context. Its 19 MPG combined is not meant to rival mass-market sedans. Instead, consider its peers. An Audi R8 V10 Performance Spyder, a direct competitor in the performance convertible space, offers 15 MPG combined. The Mercedes-AMG SL 63 Roadster, a more grand touring-oriented rival, delivers 17 MPG combined. The Chevrolet Corvette Z06 Convertible, while offering a more raw, track-focused experience, manages around 17 MPG combined. Even within its own Porsche family, the base Carrera 3.0L models push past 20 MPG combined, illustrating the GTS’s performance-focused tuning. The buyer of a GTS Cabriolet isn’t cross-shopping with a Toyota Camry; they’re weighing the ultimate driving machine against others in an exclusive segment where performance and prestige are important. The GTS’s blend of power, all-wheel-drive security, and open-air enjoyment makes its 19 MPG a perfectly acceptable trade-off for its target audience. Find all Porsche fuel economy data here.

Tips to maximize efficiency

While fuel economy isn’t the primary concern for a 911 GTS Cabriolet owner, there are still ways to optimize consumption without compromising the driving experience entirely. Using judicious throttle control, especially in city driving, is the most impactful strategy. Avoid unnecessary hard acceleration and braking; smooth inputs not only save fuel but also contribute to a more refined driving experience.

Using the car’s “Normal” driving mode rather than Sport or Sport+ will keep the engine operating in its most economical maps and the PDK transmission shifting at lower RPMs. This allows the powertrain management to prioritize efficiency over absolute performance, offering a noticeable difference in daily driving.

Regular maintenance is crucial for any high-performance vehicle, and the 911 is no exception. Ensure the engine oil is regularly changed to specification and tire pressures are maintained at the recommended levels. An efficiently running engine and properly inflated tires reduce rolling resistance, directly contributing to better fuel figures.

For convertible owners, driving with the top up at highway speeds significantly reduces aerodynamic drag. While the Cabriolet experience is a core part of its appeal, closing the roof for extended, high-speed journeys will make a measurable difference in fuel consumption.

Minimize unnecessary weight. While not a significant factor in a vehicle of this caliber, removing heavy items from the frunk or rear seating area if they aren't needed can contribute marginally to better efficiency over time. Every small reduction in effort for the engine translates to less fuel used.