22 MPG combined is not the reason anyone buys a 2023 Porsche 718 Cayman S. This is a precision instrument designed to dissect apexes and deliver unfiltered driving pleasure, not sip fuel on the way to the grocery store. The Cayman S buyer prioritizes driving dynamics and Porsche cachet above all else, accepting the car’s efficiency (or lack thereof) as a necessary compromise for the performance on offer.

City and highway performance

The EPA estimates the 2023 718 Cayman S will achieve 19 MPG in the city and 25 MPG on the highway. These figures are a product of the car’s turbocharged 2.5-liter flat-four engine, which punches well above its weight class with 350 horsepower and 309 lb-ft of torque. The optional (and highly recommended) seven-speed PDK dual-clutch automatic transmission further contributes to these ratings, delivering quick and efficient shifts both on the road and at the track. A six-speed manual is also available, which will likely result in slightly lower, but more engaging, fuel economy.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2023 Porsche 718 Cayman S at $2,650. This figure is based on driving 15,000 miles per year and using national average fuel prices. Keep in mind that this figure can vary significantly depending on your driving habits and local fuel costs. Aggressive driving, prevalent in the Cayman S owner’s DNA, will undoubtedly push this number higher. It is also important to note that the Cayman S requires premium fuel, adding to the overall cost of ownership.

Real-world expectations

While the EPA estimates provide a baseline, real-world fuel economy for the 2023 718 Cayman S will likely vary. Drivers who frequently indulge in the car’s performance capabilities will likely see numbers closer to the city estimate, or even lower. Conversely, those who primarily use the car for highway cruising with a light foot may be able to meet or even slightly exceed the 25 MPG highway rating. Regardless, expecting significantly better fuel economy than the EPA estimates is unrealistic for most Cayman S drivers.

How it compares

Compared to its rivals, the 718 Cayman S sits in the middle of the pack regarding fuel efficiency. The BMW M240i, for example, achieves a combined 26 MPG with its turbocharged inline-six. On the other hand, the Alpine A110, with its lighter weight and smaller engine, manages a slightly better 29 MPG combined. A Corvette Stingray? Expect to get around 19 MPG combined. These disparities highlight the trade-offs inherent in performance cars: prioritizing power and handling often comes at the expense of fuel economy. The 718 MPG across all years isn’t particularly high.

For those wanting better fuel economy, all Porsche fuel economy data can be reviewed.

Tips to maximize efficiency

While the 718 Cayman S is not inherently fuel-efficient, there are steps you can take to minimize fuel consumption. Avoid aggressive acceleration and braking, as these habits significantly impact fuel economy. The Cayman begs to be driven hard, but resist the urge when less gas is a priority.

Use the car’s driving modes to your advantage. The “Normal” mode prioritizes fuel efficiency by optimizing throttle response and shift points. While it may dampen the car’s sporting character, it can make a noticeable difference in fuel consumption during everyday driving.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, which reduces fuel economy. Check your tire pressure regularly and inflate them to the recommended levels specified in the owner’s manual. This simple step can improve fuel efficiency and also extend tire life.

Minimize idling. Letting the engine idle for extended periods wastes fuel. If you anticipate a prolonged stop, such as waiting in a parking lot, turn off the engine to conserve fuel. Modern engines do not require a warm-up period, so idling is largely unnecessary.