The 2017 Porsche 911 Carrera S Cabriolet, with its 3.0L flat-six engine and automatic transmission, gets a combined fuel economy of 24 MPG. This figure doesn’t define the car; it’s simply a piece of information understood by its buyers. No one chooses a Carrera S Cabriolet if maximum fuel efficiency is their priority. These are drivers who value open-top thrills, the signature flat-six howl, and razor-sharp handling above all else. They accept the car’s fuel consumption as part of the price of admission to an exclusive club of performance enthusiasts.

City and highway performance

The EPA estimates the Carrera S Cabriolet at 22 MPG in the city and 28 MPG on the highway. The city figure reflects the stop-and-go conditions that will undoubtedly be punctuated by bursts of acceleration, as the naturally aspirated engine (at least compared to the Turbo models) rewards enthusiastic throttle inputs. The expectation of 28 MPG on the highway is achievable if the driver exercises restraint, but the car’s inherent urge to devour miles at a rapid pace often means that number diminishes in real-world use. Long highway trips in a 911 allow toggling between focusing on efficiency and focusing on speed, which may be dictated by the situation.

Annual fuel cost

The EPA estimates an annual fuel cost of $2,400 for the 2017 Porsche 911 Carrera S Cabriolet. This calculation is based on driving 15,000 miles per year and using national average fuel prices. Given the car’s penchant for premium gasoline, and the propensity of its owners to drive it with gusto, this figure should be considered a baseline. Aggressive driving or higher-than-average mileage will certainly lead to a higher annual fuel bill.

Real-world expectations

While the EPA estimates offer a standardized benchmark, real-world fuel economy in the 2017 Carrera S Cabriolet is heavily dependent on driving style. Someone primarily driving short distances in urban environments, frequently engaging the car’s powerful acceleration, will likely see figures closer to the city estimate, or even slightly below. Conversely, relaxed highway cruising could yield numbers exceeding the EPA’s highway figure. Ultimately, drivers should expect a range between 20 and 30 MPG depending on their driving habits and typical routes.

How it compares

Compared to its competitors, the 2017 Carrera S Cabriolet has a unique position, since there isn’t a direct analogue. The Mercedes-AMG C63 S Cabriolet, for example, with its powerful V8, achieves an EPA-estimated 18 MPG combined, making the Porsche seem relatively efficient. On the other hand, a Jaguar F-Type V6 Convertible might achieve closer to 23 MPG combined, putting it within a similar range. For buyers considering cars like these, the 1 MPG difference isn’t usually a deciding factor; performance and brand cachet are the dominant considerations. To further explore all Porsche fuel economy data, a detailed look is readily available.

Tips to maximize efficiency

Use the ‘Normal’ driving mode when possible. While the temptation is always there to select ‘Sport’ or ‘Sport Plus’ for heightened responsiveness, using the more relaxed ‘Normal’ setting allows the transmission to upshift earlier and use higher gears, saving fuel during everyday driving. Learn more about 911 MPG across all years.

Avoid excessive idling. Letting the engine idle for extended periods, especially when it’s already warm, consumes fuel needlessly. If you anticipate a wait of more than a minute or so, simply turn off the engine, especially since the car has many convenience features that are designed to be helpful without the engine running.

Monitor tire pressure. Correctly inflated tires reduce rolling resistance which improves fuel economy. Check your tire pressure regularly, since even a small drop in pressure can negatively impact MPG. The recommended tire pressure is usually found on a sticker inside the driver’s door jamb.

Anticipate traffic flow. Smooth acceleration and braking not only contribute to a more comfortable ride but also improve fuel efficiency. By anticipating traffic conditions and maintaining a consistent speed, you can avoid unnecessary acceleration and deceleration, saving fuel in the process.

Consider the weight you are carrying. Yes, performance car drivers will not often concern themselves with weight savings, but it is an easy gain. Removing unnecessary items from the trunk can incrementally improve fuel economy. While this won’t dramatically increase MPG, every little bit helps.