24 MPG combined isn’t going to win any hypermiling contests, but it’s a figure entirely secondary to the experience of owning a 2017 Porsche 911 Carrera Cabriolet. The 3.0L flat-six engine and open-air driving are the main attractions, aspects that few buyers are willing to compromise for the sake of a few extra miles per gallon. The character of this car overshadows any concerns about how much gas it burns.

City and highway performance

The EPA estimates for the 2017 911 Carrera Cabriolet are 22 MPG in the city and 28 MPG on the highway. These figures are achieved with the automatic (AM-S7) transmission. This spread reflects the engine’s responsiveness and the effectiveness of the transmission’s programming, which balances eager acceleration with a reasonable fuel burn. While the city number is predictably lower due to stop-and-go traffic, the highway figure illustrates the potential for decent economy when cruising at consistent speeds.

Annual fuel cost

According to the EPA, the annual fuel cost for operating this 911 Cabriolet is estimated at $2,400. This figure is based on driving 15,000 miles per year and assumes national average fuel prices. Of course, your actual fuel costs will vary depending on your driving habits, fuel prices in your area, and the type of fuel you use. This estimate provides a baseline for understanding the potential cost of ownership.

Real-world expectations

While EPA figures offer a standardized benchmark, real-world fuel economy often differs. Drivers who frequently rev the engine, enjoying the characteristic Porsche sound and rapid acceleration, will likely see figures below the EPA estimates. On the other hand, those who drive more relaxed and spend more time on the highway might achieve numbers at or even slightly above the official ratings. The 911 experience is biased toward enthusiastic driving, so expect to fill up more often if you fully exploit the car’s capabilities. Checking 911 MPG across all years can provide further insight.

How it compares

Compared to other performance convertibles, the 2017 911 Carrera Cabriolet is competitive. For example, the BMW M4 Convertible with similar power achieves around 19 MPG combined, making the Porsche slightly more efficient. The Jaguar F-Type Convertible, another stylish competitor, posts figures in the low 20s. Even considering all all Porsche fuel economy data, you’ll see that these models prioritize driving pleasure and performance, with economy as a secondary consideration. The Mercedes-AMG C63 S Cabriolet, with its V8 power, consumes fuel at an even greater rate, posting combined figures in the high teens. These comparisons show that the 911 Cabriolet blends performance with a degree of efficiency that aligns with its mission as a performance-oriented daily driver.

Tips to maximize efficiency

Use the car’s driving modes. The “Normal” mode dials back throttle response and optimizes shift points for efficiency. While it’s tempting to drive in “Sport” or “Sport Plus,” reserving those modes for spirited drives will noticeably improve overall fuel economy.

Avoid aggressive acceleration and braking whenever possible. Smooth and predictable driving inputs are crucial for maximizing fuel efficiency in any car. The 911’s responsive engine makes it easy to pick up speed quickly, but resisting the urge to constantly accelerate hard will pay dividends at the pump.

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 specified in your owner’s manual. This simple maintenance step can make a tangible difference.

Consider limiting short trips. Cold starts are particularly taxing on fuel economy. Combining several errands into a single trip allows the engine to reach its optimal operating temperature, improving overall efficiency. This is especially relevant in city driving, where frequent stops and starts can significantly impact fuel consumption.