The 2023 Porsche 718 Cayman GTS 4.0L achieves an EPA-estimated 21 MPG combined, a figure that won’t win any eco-awards but accurately reflects the uncompromising performance focus of this mid-engined sports car. Buyers in this segment aren’t prioritizing ultimate fuel efficiency; they’re seeking extraordinary driving dynamics and a visceral connection to the road, and the Cayman GTS 4.0 delivers that.

City and highway performance

The 718 Cayman GTS 4.0 achieves 19 MPG in the city and 24 MPG on the highway. These figures reflect the realities of driving a high-performance sports car: spirited acceleration and frequent gear changes in urban environments increase fuel consumption, while more relaxed cruising can yield surprisingly reasonable numbers on the open road. The seven-speed dual-clutch automatic transmission (AM-S7) is programmed for lightning-fast shifts during aggressive driving and optimized fuel efficiency when driven more sedately.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2023 Porsche 718 Cayman GTS 4.0 at $2,750. This is based on driving 15,000 miles per year and using national average fuel prices. Actual fuel costs will vary depending on driving habits, location, and fuel prices at the pump. Premium fuel is required for optimal performance, so budget accordingly. This figure is a consideration for prospective buyers, as it highlights the ongoing expense of owning a high-performance vehicle like the Cayman GTS 4.0.

Real-world expectations

While the EPA estimates provide a useful benchmark, real-world fuel economy will fluctuate based on driving style and conditions. Drivers who frequently engage the Sport or Sport Plus modes and explore the upper reaches of the engine’s rev range will likely see figures below the EPA estimates. Conversely, those who prioritize smooth acceleration and use the transmission’s higher gears can nudge closer to, or even slightly exceed, the highway figure. Achieving the stated MPG requires a conscious effort to drive efficiently, which may not be the primary objective for most 718 Cayman GTS 4.0 owners.

How it compares

Within the competitive landscape, the 718 Cayman GTS 4.0’s fuel economy is average. A BMW M2, for example, achieves a similar 19 MPG combined with its inline-six engine. A Chevrolet Corvette Stingray, another performance benchmark, returns a slightly better 19 MPG city/27 MPG highway for a combined 22 MPG. The Alpine A110, prized for its lightweight construction and nimble handling, manages a more respectable 26 MPG combined. For 718 MPG across all years, see our data. These comparisons matter because while Cayman GTS 4.0 buyers aren’t hyper-focused on efficiency, understanding the relative fuel consumption is part of the overall ownership picture. Some may also consider all Porsche fuel economy data before settling on a final choice.

Tips to maximize efficiency

Resist the temptation to constantly exploit the engine’s impressive power. Smooth, deliberate acceleration will minimize fuel consumption, particularly in city driving. Every stab of the throttle sends fuel consumption skyrocketing.

Take advantage of the automatic transmission’s efficiency-optimized programming. Allow the transmission to upshift early and avoid aggressive downshifts when possible. The car will still respond quickly when needed, but you’ll save fuel during normal cruising.

Ensure your tires are properly inflated. Low tire pressure increases rolling resistance, impacting fuel economy. Check the recommended pressure on the doorjamb and maintain it consistently.

Minimize idling. Letting the engine idle for extended periods wastes fuel. If you’re going to be stopped for more than a minute, turn off the engine.

Consider using the standard drive mode for everyday commuting. While Sport and Sport Plus modes offer enhanced throttle response and performance, they also consume significantly more fuel. Reserve those modes for spirited driving sessions on your favorite back roads.