16 MPG combined isn’t going to win any fuel-sipping awards, but it’s also not the point of the 2024 Porsche 911 Turbo S Cabriolet. This is a machine engineered for blistering performance delivered with a level of luxury expected in a six-figure convertible. Its owners prioritize acceleration and exclusivity far above Prius-like fuel consumption. They understand the price of admission, and that cost extends beyond the sticker.

City and highway performance

The official EPA figures reveal a difference: 14 MPG in the city and 20 MPG on the highway. That disparity isn’t unusual for high-performance vehicles. Stop-and-go urban driving punishes fuel economy in a Turbo S Cabriolet, where the instant torque encourages frequent uses of acceleration. Highway driving, on the other hand, allows the engine and advanced 8-speed automatic transmission to settle into a more efficient rhythm, albeit at speeds that are still far from sedate.

Annual fuel cost

The EPA estimates an annual fuel cost of $3,600 for the 2024 Porsche 911 Turbo S Cabriolet. This figure is calculated based on driving 15,000 miles per year, using a national average fuel price. Premium fuel is mandatory, of course, and fluctuations in gasoline prices could dramatically affect this number, leading to both joy and despair when filling up. This is simply the cost of enjoying one of the world’s most potent convertibles.

Real-world expectations

Those annual EPA figures are best viewed as a benchmark, not a guaranteed outcome. Real-world fuel economy in a 911 Turbo S Cabriolet will change a lot based on driving style. Frequent trips to redline, extended periods of boost, or even just a heavy foot around town will quickly see your MPG plummet below the EPA estimates. But disciplined highway cruising may allow you to approach, or perhaps even exceed, the 20 MPG rating. It’s unlikely the typical Turbo S driver will be concerned with fuel-saving measures.

How it compares

Consider the competition. A McLaren 720S Spider, while offering similar levels of performance and open-air thrills, achieves a marginally better 18 MPG combined. The Ferrari Roma Spider, with its slightly less potent twin-turbo V8, manages around 19 MPG combined. An Aston Martin Vantage Roadster, focused more on grand touring than outright track performance, delivers an estimated 20 MPG combined. These small differences are likely irrelevant to buyers in this segment. The marginal fuel savings rarely outweigh the specific prestige, performance characteristics, or design aesthetic that draws an individual to a particular model. You can view 911 MPG across all years to see how this model compares to older versions.

Tips to maximize efficiency

While squeezing every last mile out of a gallon might not be a primary concern for a Turbo S owner, some simple strategies can still improve fuel economy. The first is avoiding excessive idling. The 3.7L engine is at its least efficient when stationary, so minimizing idling time, especially when the engine is cold, can have a measurable impact.

Smooth and progressive acceleration is another key factor. The temptation to unleash the Turbo S’s substantial power is always present, but gentle throttle inputs, especially from a standstill, will help save fuel. Anticipate traffic flow, and avoid sudden acceleration or braking maneuvers whenever possible.

Tire pressure also plays a role. Ensuring that your tires are inflated to the recommended pressure level, found on the driver’s side doorjamb, minimizes rolling resistance, which directly translates into improved fuel economy. Keep in mind that frequent track days or spirited driving may require adjusting tire pressures for optimal grip and performance, potentially sacrificing some fuel efficiency in the process.

Finally, consider using the car’s driving modes carefully. The “Normal” mode prioritizes fuel efficiency over peak performance, adjusting throttle response and gear selection to optimize economy. While this mode may tame the Turbo S’s wild side, it can be a useful option for longer highway journeys or when simply commuting around town. If you want to see all Porsche fuel economy data, we have plenty of information on our site.