19 MPG combined is a figure many sports car buyers would dismiss outright. But for the driver drawn to the experience of a Porsche 911 Carrera GTS Cabriolet, fuel efficiency is something to consider. This isn’t a commuter car; it’s a meticulously engineered performance machine designed to deliver an unparalleled open-air driving experience. Fuel economy, while never irrelevant, is less important than the sound of the flat-six engine, the precision of the handling, and the shape as it slices through the wind.

City and highway performance

The EPA estimates that this 911 variant will achieve 17 MPG in the city and 23 MPG on the highway. The city number reflects the reality of urban driving, where the engine spends more time idling or accelerating from a standstill. The highway figure illustrates the benefit of consistent speeds and reduced throttle input. Remember that these are just estimates. The harder you push the car, the more fuel you’ll burn, and aggressive acceleration and frequent high-speed driving will quickly lower those numbers. However, a gentle right foot and anticipatory driving can nudge them upwards, though restraint isn’t exactly the strong suit of the typical GTS Cabriolet owner.

Annual fuel cost

The EPA calculates the annual fuel cost for the 2024 Porsche 911 Carrera GTS Cabriolet at $3,050. This figure is based on driving 15,000 miles per year and using national average fuel prices. It’s important to recognize that this is just a guideline. Your actual fuel costs will vary depending on how much you drive, where you drive, and how aggressively you drive. Someone using their GTS primarily for weekend drives on winding backroads will likely spend less than the $3,050 estimate, but someone using it for a daily commute in heavy traffic, interspersed with the occasional track day, could easily exceed it. It all comes down to driving habits and local fuel prices.

Real-world expectations

Forget the EPA numbers for a moment. What can you actually expect? Most GTS Cabriolet owners are unlikely to worry too much about fuel. This is a car meant to be enjoyed, to be driven with enthusiasm. Expect to see figures around the EPA estimates if you drive moderately. However, if you plan on exploring the upper reaches of that glorious flat-six, be prepared for significantly lower numbers. Seasonal variations can also impact fuel economy, and cold weather typically results in lower MPG due to factors like increased engine friction and the use of winter-blend gasoline. To see 911 MPG across all years, check out our database.

How it compares

The fuel economy of the 911 Carrera GTS Cabriolet needs to be viewed in the context of its competition. A BMW M4 Competition Convertible, for example, achieves a combined 18 MPG, putting it squarely in the same range. The Mercedes-AMG C63 S Cabriolet (previous generation with V8) delivered even lower figures, closer to 16 MPG combined. Even within the Porsche family, the all-wheel-drive 911 Turbo Cabriolet sees similar figures. Fuel efficiency isn’t the main concern for buyers in this class; they prioritize performance, driving dynamics, and open-top thrills. The driver looking for more fuel savings might consider other vehicles, and all Porsche fuel economy data can be found in our resource library here. The GTS Cabriolet’s fuel economy is typical for its high-performance class.

Tips to maximize efficiency

Fuel economy may not be the top priority, but there are still ways to get a few extra miles from each gallon. Avoid aggressive acceleration, especially from a standstill. The twin-turbocharged engine delivers ample torque, so there’s no need to mash the throttle at every opportunity. Smooth acceleration will reduce fuel consumption.

Anticipate traffic flow and maintain a steady speed whenever possible. Frequent braking and accelerating wastes fuel, and by looking ahead and anticipating changes in traffic patterns, you can minimize throttle input and maximize coasting. Use the car’s “Normal” driving mode when appropriate. While “Sport” and “Sport Plus” modes sharpen throttle response and optimize performance, they also consume more fuel.

Ensure your tires are properly inflated. Underinflated tires increase rolling resistance, which reduces fuel economy. Check your tire pressures regularly and inflate them to the recommended levels. A properly maintained engine will also help with fuel economy. Regular oil changes, air filter replacements, and spark plug maintenance ensures that the engine is running well.

Consider using the automatic start/stop feature in city driving. Some drivers find it intrusive, but it can save fuel by shutting off the engine while idling at traffic lights. Be mindful of carrying excess weight, and unnecessary items in the trunk or passenger compartment add weight to the vehicle, which reduces fuel economy. Removing unnecessary items can make a small but measurable difference.