24 MPG combined would have been unheard of in a performance car of this caliber even a decade ago. The 2017 Porsche Cayman S isn’t just about numbers; it’s about the experience. This is a car for the enthusiast who values handling precision, driver involvement, and the pure joy of a perfectly executed apex. Fuel economy is less important, although a respectable 24 MPG allows owners to enjoy their Cayman S without excessive guilt at the gas pump.

City and highway performance

The EPA estimates for the 2017 Cayman S reveal a contrast, reflective of its intended use. The city rating is 21 MPG, a number that reflects the constant stop-and-go driving, aggressive acceleration from lights, and the inevitable traffic jams that define urban commuting. The Cayman S, even with its relatively efficient turbocharged four-cylinder, encourages spirited driving, which will always impact fuel consumption in a city.

The highway figure is a more palatable 28 MPG. This reflects the Cayman S’s ability to settle into a relaxed cruise, the seven-speed automatic (AM-S7) finding the optimal gear for efficiency. Even at highway speeds, a tap of the throttle unleashes a surge of power, reminding you that this is a true performance machine. Maintaining a steady speed and resisting the urge to exploit the Cayman S’s capabilities is key to achieving that upper end of the fuel economy range on the open road.

Annual fuel cost

The EPA estimates an annual fuel cost of $2,400 for the 2017 Porsche Cayman S. This calculation is based on driving 15,000 miles per year, using national average fuel prices. Individual fuel costs will vary depending on local fuel prices and driving habits. Owners who primarily drive in the city or have a heavier foot will likely exceed this figure, while those who prioritize highway driving and employ a more conservative driving style may find themselves spending less. Understanding that the $2,400 figure is an average allows prospective buyers to realistically assess the long-term running costs.

Real-world expectations

While the EPA provides a standardized benchmark, real-world fuel economy often differs. Cayman S owners frequently report figures slightly below the EPA’s combined estimate, especially when the car is used primarily for shorter, more aggressive drives. Enthusiasts aren’t buying a Cayman S to hypermile; they’re buying it for the experience. Expect to see numbers closer to 20-23 MPG in mixed driving, with the potential for slightly better results on longer highway journeys if you can resist the temptation to accelerate with the turbocharged engine.

How it compares

The fuel economy of the 2017 Cayman S positions it competitively within its segment. The BMW M240i, for instance, is rated at 25 MPG combined with its turbocharged inline-six. That minor difference will hardly sway someone choosing between the two vehicles, but looking at all Porsche fuel economy data is important to understand if you’re truly interested in optimizing your gas mileage. Across a wider range of cars, the Audi TTS, with its 23 MPG combined, highlights the compromise between performance and efficiency these types of vehicles demand. Even the Alpine A110, known for its lightweight design, achieves around 26 MPG combined, showing the limits of what’s possible in this high-performance class. For comparison, be sure to review the CAYMAN MPG across all years to see how the 2.5L version stacks up.

Tips to maximize efficiency

Use the Cayman S’s driving modes. The “Normal” mode prioritizes fuel efficiency by optimizing throttle response and shift points. While it compromises some of the car’s sporting character, it’s a valuable tool for maximizing MPG during everyday driving, particularly in slower traffic.

Gentle acceleration and braking are key. Avoid aggressive launches and hard braking, as these actions consume significantly more fuel. Smooth, progressive inputs will not only improve fuel economy but also enhance the overall driving experience.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, which negatively impacts fuel efficiency. Regularly check and maintain the recommended tire pressure, which can be found on the driver’s side doorjamb.

Reduce unnecessary weight. Carrying excess cargo adds weight to the vehicle, requiring more energy to accelerate and maintain speed. Remove any unnecessary items from the trunk and passenger compartment to improve fuel efficiency.

Consider the road conditions. Avoid routes with heavy traffic congestion or frequent stop-and-go situations when possible, as these conditions are detrimental to fuel economy. Planning your route and driving during off-peak hours can help improve your MPG.