21 MPG combined isn’t going to win any green awards, but for the 2024 Porsche 718 Cayman GTS 4.0L, it’s almost beside the point. This is a car built for visceral thrills, not hypermiling. The naturally aspirated flat-six engine provides an aural experience that many enthusiasts consider worth more than any fuel savings. Let’s be realistic, you don’t buy a Cayman GTS 4.0 expecting Prius-like efficiency. You buy it for the razor-sharp handling, the perfectly weighted steering, and the sheer joy of driving a mid-engined sports car. This MPG is simply the price of admission.

City and highway performance

The EPA estimates the 718 Cayman GTS 4.0L at 19 MPG in the city and 24 MPG on the highway. These figures accurately reflect the car’s personality. In urban environments, the spirited engine and responsive throttle encourage frequent bursts of acceleration, bringing the city MPG down. On the open road, while capable of achieving its 24 MPG rating, the temptation to dip into the engine’s power reserve will likely keep averages a bit lower. Few owners buy this car to cruise in top gear at 65 mph.

Annual fuel cost

According to the EPA, the estimated annual fuel cost for the 2024 Porsche 718 Cayman GTS 4.0L is $2,750. This figure is based on driving 15,000 miles per year and using national average fuel prices for premium gasoline, which this car requires. It’s crucial to remember this is just an estimate. Individual driving habits, local fuel prices, and the percentage of city versus highway miles driven can all significantly impact the actual amount spent on fuel.

Real-world expectations

While the EPA figures provide a baseline, expect real-world MPG to fluctuate. Aggressive driving will impact fuel economy considerably, potentially dropping the combined average to the high teens. Conversely, careful drivers focusing on smooth acceleration and consistent speeds can approach, or even slightly exceed, the EPA estimates. The type of roads driven also matter. Stop-and-go traffic is the enemy of any engine’s efficiency. This car is often used for weekend drives, track days, and spirited canyon runs. These use cases generally produce lower fuel economy than typical commuting.

How it compares

The 718 Cayman GTS 4.0L isn’t alone in the sports car segment. The BMW M2, with its 3.0L turbocharged inline-six, achieves around 19 MPG combined. A Toyota Supra 3.0 offers better efficiency at 25 MPG combined, while a Chevrolet Corvette Stingray manages around 19 MPG combined, despite its V8 engine. These comparisons highlight a trade-off. The Porsche offers a uniquely pure driving experience and engine, but at the cost of slightly worse fuel consumption than some of its competitors. For those prioritizing raw MPG, the Porsche isn’t necessarily the best choice. For the enthusiasts who value driving feel, it still wins.

Tips to maximize efficiency

Ensure your tires are properly inflated. This reduces rolling resistance and helps the engine work less to maintain speed. Check your tire pressures at least once a month and adjust according to the sticker on the driver’s side door jamb.

Avoid aggressive acceleration and braking. The naturally aspirated engine of the Cayman GTS 4.0L is responsive, but smooth, progressive inputs will conserve fuel. Imagine there’s a cup of coffee on the dash, avoid spilling it.

Plan your routes to minimize stop-and-go traffic. Idling consumes fuel without covering any distance. If you anticipate long stops, consider turning off the engine (though this is not recommended for short stops due to wear on the starter motor).

Use Porsche’s driving modes judiciously. The “Normal” mode will optimize fuel efficiency by softening throttle response and shifting at lower RPMs compared to “Sport” or “Sport Plus.” A steady right foot can keep the car in Normal mode for a good portion of your drive.

Keep up with regular maintenance. A well-maintained engine runs more efficiently. Ensure that oil changes, air filter replacements, and other scheduled maintenance are performed promptly as outlined in the owner’s manual. See all Porsche fuel economy data. Also check out 718 MPG across all years.