20 MPG combined isn’t going to win the 2022 Porsche 718 Cayman GT4 any awards for lower fuel costs. But let’s be honest: If you’re seriously considering this car, you’re prioritizing apexes, throttle response, and that glorious flat-six soundtrack far above sipping fuel. The GT4 isn’t about practicality; it’s about pure, unfiltered driving pleasure. For the enthusiast who views driving as an art form, the fuel bill is simply the price of admission.

City and highway performance

The EPA estimates peg the 718 Cayman GT4 at 18 MPG in the city and 24 MPG on the highway. The city figure reflects the constant stop-and-go, which inevitably impacts fuel consumption, especially with a naturally aspirated engine that loves to rev. The highway number, however, is somewhat respectable, even if it’s unlikely you’ll be cruising at a steady 65 MPH for long stretches. The allure of dipping into that power reserve, even on long trips, is simply too strong. The automatic (AM-S7) transmission, while offering lightning-fast shifts, is geared for performance, not ultimate economy. This contributes to the real-world MPG figures rarely matching the EPA’s best estimates.

Annual fuel cost

The EPA calculates the annual fuel cost for the 2022 Porsche 718 Cayman GT4 at $2,900. This figure is based on driving 15,000 miles per year and using the national average fuel price for premium gasoline, which this car requires. Keep in mind that fuel prices fluctuate, and your individual driving habits will significantly impact this number. If you plan on tracking your GT4 regularly, or even indulging in spirited weekend drives, expect that figure to climb notably.

Real-world expectations

While the EPA figures offer a baseline, real-world MPG for the 718 Cayman GT4 often falls slightly below those numbers. Expect to see averages closer to 16-17 MPG in mixed driving scenarios with a heavy foot. Highway runs might yield closer to 22 MPG if you resist the urge to repeatedly explore the upper reaches of the tachometer. Track days, autocross events, or extended periods of aggressive driving will plummet the MPG into the low teens, or even single digits. It’s the price you pay for unadulterated performance. For a broader view, you can review 718 MPG across all years.

How it compares

Competitors to the GT4, such as the BMW M4 Competition (around 19 MPG combined) and the Audi RS5 (21 MPG combined), offer broadly similar fuel economy. However, those cars offer different experiences. The M4 and RS5 are more focused on daily driving and offer more practicality and comfort than the razor-sharp GT4. A closer competitor, such as the Lotus Emira (fuel economy data unavailable), prioritizes similar levels of driver engagement, but its fuel economy profile remains to be seen. The Chevrolet Corvette Stingray, while not a direct competitor, delivers significantly better MPG (19 city, 27 highway) thanks to its more efficient engine and cylinder deactivation technology. For a broader view, you can review all Porsche fuel economy data.

Tips to maximize efficiency

While the 718 Cayman GT4 isn’t designed for hypermiling, there are a few techniques that can help stretch your fuel budget. Avoid short trips where the engine doesn’t have a chance to reach optimal operating temperature, as cold starts burn significantly more fuel. Plan your routes carefully to avoid stop-and-go traffic, especially during peak hours.

Smooth acceleration and braking can also make a difference. The GT4 begs to be driven aggressively, but modulating the throttle and anticipating traffic can minimize wasted fuel from hard acceleration and subsequent braking. Use the rev range mindfully, and avoid consistently pushing the engine to its redline, especially when cruising on the highway.

Ensure your tires are properly inflated. Underinflated tires increase rolling resistance, which significantly impacts fuel economy. Check your tire pressures regularly and maintain them at the recommended levels listed on the driver’s side doorjamb.

Finally, lighten your load. Remove any unnecessary weight from the car, as this reduces the amount of energy required to accelerate and maintain speed. Every pound counts, especially in a performance-focused vehicle like the GT4.