19 MPG combined is what you get for driving the 2023 Porsche 911 Carrera 4 GTS Cabriolet. Let’s be frank: nobody who buys this car is prioritizing efficiency. It’s not about squeezing every last mile from a gallon, it’s about the unparalleled driving experience only a 911 GTS can deliver, with the added thrills (and occasional hair-related challenges) of open-top motoring. Fuel economy is a tertiary concern, at best, for the enthusiast who chooses this specific blend of performance, all-weather capability, and iconic design.

City and highway performance

The EPA estimates the 911 Carrera 4 GTS Cabriolet at 17 MPG in the city and 22 MPG on the highway. Urban driving, with its stop-and-go nature, will inevitably take a toll on fuel consumption, especially given the temptation to exploit the engine’s responsiveness. Highway cruising, while more efficient, is still not where this Porsche shines. Long, straight stretches are a test of restraint; the car begs to be unleashed on winding roads where its all-wheel-drive system and finely tuned suspension can truly demonstrate their capabilities. These EPA numbers reflect the potential of the vehicle, not necessarily the practices of the average owner during their daily driving.

Annual fuel cost

The estimated annual fuel cost for the 2023 Porsche 911 Carrera 4 GTS Cabriolet is $3,050, according to the EPA. This figure is based on driving 15,000 miles per year and using national average fuel prices. Keep in mind that premium fuel is required for optimal performance, and fluctuations in gasoline prices can significantly impact this estimate so owners must be prepared for these changes during ownership.

Real-world expectations

Forget the EPA numbers. Real-world MPG for this car is highly dependent on driving style. Someone sticking to break-in procedures, and resisting the siren song of the flat-six’s intoxicating wail, might approach the EPA estimates. The more likely scenario involves spirited driving, track days, and weekend canyon runs, all of which will drag the average down considerably. Expect figures closer to the mid-teens in mixed driving if you savor the car’s performance potential. A lighter foot could stretch it into the high teens, but frankly, that defeats the purpose of owning a GTS.

How it compares

The 911 Carrera 4 GTS Cabriolet exists in a rarefied space, but there are a few potential rivals. The Mercedes-AMG SL 63, for instance, offers similar levels of performance and luxury in a convertible package, but manages only 16 MPG combined. The Audi R8 Spyder, another mid-engine exotic, lands around 17 MPG combined. Even within the Porsche family, the all Porsche fuel economy data varies considerably; opting for a base 911 Carrera Cabriolet (RWD) improves fuel economy to 20 MPG combined, but sacrifices some of the GTS’s hardcore performance. These comparisons matter because, even at this price point, buyers are astute and evaluate their options from all angles. They carefully consider the 911 MPG across all years to determine the most efficient model possible while meeting the desired level of sportiness.

Tips to maximize efficiency

Select the “Normal” driving mode whenever possible, especially during mundane commutes. The GTS’s Sport and Sport Plus modes sharpen throttle response and hold gears longer, which is great for spirited driving, but detrimental to fuel economy.

Resist the urge to constantly accelerate and brake aggressively. Smooth, predictable driving will minimize unnecessary fuel consumption, even if it tempers the driving experience.

Ensure that your tires are properly inflated. Underinflated tires increase rolling resistance, forcing the engine to work harder and burning more fuel. Check the door jamb sticker for the recommended tire pressure.

Avoid prolonged idling. If you’re stopped for more than a minute, turn off the engine. Modern engines are designed to restart quickly and efficiently, minimizing the impact on fuel consumption.

Consider a lightweight set of aftermarket wheels. Reducing unsprung weight can improve acceleration and fuel economy, although the gains may be marginal. It will, however, change handling considerably.