22 MPG combined likely won’t be the deciding factor for anyone considering the 2021 Porsche 718 Cayman S. It’s not a family SUV or a hybrid commuter, but a compromise for the performance and driving experience of this mid-engined sports car. The Cayman S is for enthusiasts who crave precision handling, immediate throttle response, and the thrill of a finely tuned machine. For these buyers, fuel efficiency is a lower priority.

City and highway performance

The EPA estimates the 2021 Porsche 718 Cayman S 2.5L with the automatic (AM-S7) transmission gets 19 MPG in the city and 25 MPG on the highway. These figures reflect the different demands on the engine during various driving conditions. City driving, with its stop-and-go traffic and lower average speeds, leads to lower efficiency because the engine idles and accelerates more. Highway driving, with its consistent speeds and less braking, allows the engine to operate more efficiently, resulting in the higher MPG.

Annual fuel cost

Based on the EPA’s estimates of 15,000 miles per year and national average fuel prices, the annual fuel cost for the 2021 Porsche 718 Cayman S is $2,650. This assumes a specific percentage split between city and highway driving, but individual driving habits, local fuel prices, and even tire pressures can significantly impact this figure. Aggressive driving will increase fuel consumption, while a more relaxed style can improve it.

Real-world expectations

The EPA’s estimates provide a useful baseline. However, real-world fuel economy often differs. The 718 Cayman S, with its turbocharged engine and sporting nature, is particularly susceptible to this variation. The temptation to use the engine’s power and the car’s handling will affect fuel consumption. Drivers who frequently use Sport or Sport Plus modes can expect significantly lower MPG than the EPA estimates. Those who prioritize smooth acceleration and anticipate traffic flow might achieve figures closer to or even slightly above the EPA’s highway rating.

How it compares

The 2021 Porsche 718 Cayman S’s fuel economy falls in the middle of other sports cars. The BMW M4 Competition, for instance, is rated at 16 MPG city and 23 MPG highway. The base Chevrolet Corvette, with its larger V8 engine, manages 16 MPG city and 24 MPG highway. Even the smaller Mazda MX-5 Miata achieves 26 MPG city and 35 MPG highway. The Acura NSX, a hybrid supercar, boasts 21 MPG city and 22 MPG highway. These comparisons show that the Cayman S delivers reasonable fuel economy considering its performance, but it’s not the most efficient sports car in its class. To explore all Porsche fuel economy data, consider the broader model range.

Tips to maximize efficiency

Don’t constantly test the engine’s limits. Drive smoothly and avoid extreme acceleration, especially from a standstill, which saves fuel and extends tire life.

Keep optimal tire pressure. Under-inflated tires increase rolling resistance, which reduces fuel economy. Check your tire pressure regularly and inflate them to the levels are recommended on the sticker inside the driver’s side doorjamb or in your owner’s manual.

Use the correct fuel octane. The 2021 Porsche 718 Cayman S requires premium fuel. Using lower octane fuel can reduce performance and slightly decrease fuel economy. See the owner’s manual or fuel door for the recommended octane rating.

Don’t idle for too long, as it wastes fuel. If you’ll be stopped for more than a minute, turn off the engine. Explore 718 MPG across all years to see if different models offer better fuel efficiency.

Remove unnecessary weight from the car to reduce the load on the engine and improve fuel economy. Take out items in the trunk that you don’t need regularly.