25 MPG combined won’t win any green awards, but it’s an acceptable number for the 2018 Porsche Cayman with the 2.0L turbocharged four-cylinder engine. This isn’t a commuter car, although it can certainly handle daily duties. This is a sports car, and fuel economy is a secondary consideration for the enthusiast who prioritizes sharp handling, a responsive engine, and the sheer joy of driving above all else. Cayman owners are buying a driving experience, and 25 MPG is the price.

City and highway performance

The EPA estimates for the 2018 Porsche Cayman 2.0L, equipped with the seven-speed automatic transmission (AM-S7), break down to 22 MPG in the city and 29 MPG on the highway. The city number reflects stop-and-go traffic, where the engine is constantly accelerating and decelerating, negating the benefits of the Cayman’s relatively light weight and aerodynamic profile. The highway figure is more promising, demonstrating that the turbocharged engine can cruise efficiently when not being pushed hard. However, many Cayman drivers will find themselves dipping into the boost frequently, making the highway figure somewhat optimistic in real-world usage.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2018 Porsche Cayman 2.0L at exactly $2,300 per year. This calculation assumes 15,000 miles of driving annually, with a blend of city and highway miles reflecting the EPA’s combined MPG figure. The estimate is also based on the national average fuel prices at the time of calculation. Of course, fuel costs can vary significantly depending on driving habits. Aggressive driving will burn more fuel, while a more relaxed driving style can improve fuel economy. Owners should also factor in the cost of premium fuel, which is required for optimal performance and long engine life.

Real-world expectations

While the EPA estimates provide a useful baseline, real-world fuel economy for the 2018 Porsche Cayman 2.0L will vary depending on individual driving habits and conditions. Drivers who frequently engage in aggressive acceleration, track days, or spirited backroad drives will likely see fuel economy numbers lower than the EPA estimates. Drivers who prioritize smooth acceleration, maintain consistent speeds, and avoid unnecessary idling may be able to achieve or even exceed the EPA estimates. Understanding how your own driving style impacts fuel consumption is crucial for managing your fuel costs. You can view CAYMAN MPG across all years.

How it compares

Compared to other sports cars, the 2018 Porsche Cayman 2.0L’s fuel economy is competitive. The BMW M240i, for example, delivers around 25 MPG combined with its turbocharged inline-six engine, similar to the Cayman but with significantly more power. The Alfa Romeo 4C Spider, a more hardcore and lightweight sports car, achieves roughly 28 MPG combined, prioritizing lightness and agility over outright power. Even within the Porsche lineup, comparing all Porsche fuel economy data shows the Cayman’s larger-engined variants, like the Cayman S, will naturally return lower MPG figures. Buyers considering the Cayman often weigh performance against fuel economy, and the 2.0L strikes a balance for those seeking a sports car that is also relatively efficient.

Tips to maximize efficiency

Pay close attention to tire pressures. Properly inflated tires reduce rolling resistance, improving fuel economy. Check your tire pressures regularly and inflate them to the recommended levels found on the doorjamb sticker. Even a slight drop in pressure can negatively impact fuel efficiency.

Avoid aggressive acceleration and braking. Smooth, gradual acceleration and deceleration can significantly improve fuel economy. The Cayman’s responsive engine can tempt drivers to accelerate quickly, but resisting that urge will save fuel. Anticipating traffic flow and braking smoothly will also help.

Use the automatic start/stop function carefully. The Cayman is equipped with an automatic start/stop function that shuts off the engine when the car is stopped, such as at a traffic light. While this feature can improve fuel economy in city driving, it’s not always desirable in certain situations. The system can be easily deactivated with a button on the center console.

Minimize idling. Idling consumes fuel without moving the car. If you’re going to be stopped for more than a minute or two, turn off the engine. Modern engines are designed to be restarted frequently without causing damage, and restarting consumes less fuel than idling for an extended period. This is especially relevant in urban environments.