24 MPG combined is a reasonable figure for the 2021 Porsche 718 Cayman with the 2.0L turbocharged four-cylinder engine, but it’s almost beside the point. People drawn to the Cayman aren’t prioritizing fuel efficiency; they’re seeking a precision sports car with a mid-engine layout, exceptional handling, and a badge that carries significant weight. This Cayman isn’t a commuter car; it’s a focused driving tool. Porsche buyers generally understand that high performance comes at a price, including trips to the gas station.

City and highway performance

The EPA estimates the 2021 718 Cayman with the 2.0L engine and automatic transmission at 21 MPG in the city and 27 MPG on the highway. The city figure reflects stop-and-go driving where the engine is working harder and the turbocharger spools up frequently, using more fuel,. The highway number, however, shows the Cayman’s potential for efficiency when cruising at a constant speed. While 27 MPG may not sound exceptional, it’s respectable for a sports car designed for spirited driving. Understanding where you do most of your driving is critical to setting your fuel expectations, because canyon carving on the weekends lowers your MPG versus longer highway trips.

Annual fuel cost

The EPA calculates the annual fuel cost for the 2021 Porsche 718 Cayman 2.0L at $2,400. This figure is based on driving 15,000 miles per year and using national average fuel prices. Of course, this is just an estimate, and your actual fuel costs will vary depending on your driving habits, the type of fuel you use (premium is recommended, and typically costs more), and local fuel prices. If you drive fewer miles, you will spend less. Aggressive driving also drops the MPG, costing you even more.

Real-world expectations

While the EPA estimates provide a useful baseline, it’s important to understand that real-world fuel economy can differ significantly. Owners who frequently drive enthusiastically, participate in track days, or spend most of their time in heavy traffic will likely see lower MPG numbers. Conversely, drivers who primarily use their Cayman for longer trips with light or moderate acceleration might exceed the EPA’s highway rating. The 7-speed dual clutch transmission’s programming favors efficient shifting at lower engine speeds in normal driving mode to balance performance with fuel consumption.

How it compares

The 718 Cayman’s fuel economy should be considered in light of its performance and its competitive set. The BMW M240i Coupe, with its more powerful engine and rear-wheel drive, achieves around 26 MPG combined. The Toyota GR Supra 2.0, another 4-cylinder sports car, boasts slightly better figures at around 28 MPG combined. Even within the Porsche family, comparing the Cayman’s fuel efficiency to the all Porsche fuel economy data reveals that larger, more powerful models naturally consume more fuel. While the 718 offers a balance of performance and efficiency, fuel economy rarely tops the priority list for drivers in this segment shopping for the best 718 MPG across all years.

Tips to maximize efficiency

Drive smoothly and avoid aggressive acceleration. The Cayman’s turbocharger is responsive, but it’s also a major contributor to fuel consumption. Smooth, controlled throttle inputs will help keep you out of the boost and maximize your MPG. Use the car’s “Normal” driving mode for everyday driving. This mode optimizes the transmission for fuel efficiency by upshifting early and keeping the engine in its most efficient operating range.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, which drags down fuel economy. Check your tire pressures regularly and inflate them to the recommended levels listed on the door jamb sticker. The Cayman is a performance vehicle, so use a quality tire pressure gauge to ensure accurate readings.

Minimize idling. Letting your engine idle for extended periods wastes fuel, use start/stop when possible. If you’re waiting for someone or stopped for more than a minute or two, turn off the engine. This simple habit can add up to significant fuel savings over time.

Keep your car properly maintained. Regular maintenance, including oil changes, air filter replacements, and spark plug replacements, ensures that your engine is running efficiently. A well-maintained engine consumes less fuel and performs better.