21 MPG combined isn’t going to win any hypermiling awards, but for the 2022 Porsche 718 Cayman GTS 4.0L, it’s an acceptable trade-off. This isn’t a car purchased for its frugality; it’s a precision instrument designed to deliver unparalleled driving pleasure. The buyer of this car prioritizes a naturally aspirated, high-revving flat-six engine over squeezing every last drop of fuel. They’re looking for thrills, not virtue signaling, and understand the compromises involved.

City and highway performance

The 718 Cayman GTS 4.0L achieves an EPA-estimated 19 MPG in the city and 24 MPG on the highway. The lower city figure reflects the constant stop-and-go driving, where the engine spends more time idling or accelerating from a standstill. These conditions punish fuel efficiency. The highway number is more palatable, showcasing that even this performance-oriented machine can achieve reasonable mileage when cruising at consistent speeds. The seven-speed automatic transmission (AM-S7) plays a role here, keeping the engine in its sweet spot while maximizing efficiency.

Annual fuel cost

The EPA estimates an annual fuel cost of $2,750 for the 2022 Porsche 718 Cayman GTS 4.0L. This figure is based on driving 15,000 miles per year and using national average fuel prices, which may fluctuate considerably depending on location and driving habits. It’s a useful benchmark for comparison, but individual expenses can vary greatly based on how and where the car is driven, and of course, the ever-changing price of premium gasoline.

Real-world expectations

While the EPA numbers offer a starting point, real-world fuel economy often deviates. Drivers who frequently exploit the engine’s capabilities on twisty back roads will likely see numbers below the official estimates. Conversely, those who primarily use the car for longer highway journeys, and who exercise restraint behind the wheel, might achieve figures closer to, or even slightly exceeding, the 24 MPG highway rating. Remember, the 4.0-liter flat-six is addictive, and resisting the urge to explore its full potential requires self-control.

How it compares

Compared to rivals, the 718 Cayman GTS 4.0L’s fuel economy falls within the expected range for its performance class. A BMW M2 Competition, for example, delivers approximately 20 MPG combined from its turbocharged inline-six, despite being more powerful. The Alpine A110, a lighter and less powerful alternative, achieves around 25 MPG combined, reflecting its focus on minimizing weight and maximizing agility over outright horsepower. The Porsche’s own 718 Cayman GT4, with a similar engine but more aggressive tuning and aerodynamics, is rated at 18 MPG combined. These comparisons make it clear: the GTS 4.0 occupies a sweet spot between raw performance and relative efficiency within its competitive set. Be sure to investigate 718 MPG across all years to see how this model compares.

Tips to maximize efficiency

While fuel efficiency might not be the primary concern for a 718 Cayman GTS 4.0L owner, there are strategies to improve mileage without sacrificing too much enjoyment. Avoiding excessive idling, especially during warm-up, can make a noticeable difference. The engine is happiest, and most efficient, when it’s up to operating temperature and moving.

Gentle acceleration from a standstill and maintaining a steady speed on the highway are fundamental fuel-saving techniques. Resist the urge to constantly accelerate and brake aggressively; smooth and progressive inputs are key. Anticipating traffic flow and looking far ahead will also reduce unnecessary braking.

Ensure that your tires are properly inflated. Underinflated tires increase rolling resistance, which negatively impacts fuel economy. Check the tire pressure regularly and adjust it according to the manufacturer’s recommendations. Consult all Porsche fuel economy data if you are interested in another Porsche model.

Consider using the car’s driving modes strategically. The “Normal” mode offers a more relaxed throttle response and prioritizes fuel efficiency. Save the more aggressive “Sport” and “Sport Plus” modes for dedicated driving roads or track days where fuel consumption is less of a concern.