18 MPG combined. That figure for the 2025 Porsche Cayenne GTS Coupe 4.0L 8-cyl isn’t just a number; it’s a declaration. This vehicle isn’t for the fuel-frugal, nor does it pretend to be. This is a high-performance luxury SUV, designed for a driver who prioritizes exhilaration, exquisite engineering, and the unmistakable rumble of a twin-turbo V8. The person who opts for a Cayenne GTS Coupe isn’t cross-shopping with hybrid crossovers; they’re looking at AMG, M, and RS badging, and for them, 18 MPG is a perfectly acceptable consequence of 500 horsepower and a chassis tuned for surgical precision. It’s the cost of admission to a driving experience that few SUVs can match, and it’s a cost these buyers willingly pay for the blend of luxury, utility, and undeniable Porsche performance. Check out all Porsche fuel economy data for a broader perspective on the brand’s offerings.

City and highway performance

Diving deeper into the EPA ratings, the 2025 Cayenne GTS Coupe delivers 16 MPG in the city and 22 MPG on the highway. The city figure, at 16 MPG, reflects the inevitable reality of moving a 5,000-pound-plus vehicle, even one as brilliantly engineered as this, through stop-and-go traffic with a potent 4.0L V8 at its heart. Porsche’s smooth automatic transmission (S8) does its best to mitigate consumption with smooth shifts and intelligent gear selection, but the sheer force of acceleration readily available tends to dictate real-world city consumption for an enthusiastic driver. On the highway, 22 MPG is a respectable number for such a powerful V8, hinting at the engine’s efficiency when cruising at steady speeds and the aerodynamic benefits of the Coupe’s sleek design. For drivers who frequently embark on long journeys, this highway figure provides a welcome measure of cruising range, allowing them to enjoy the Cayenne GTS’s refined cabin and effortless power for extended periods between refueling stops. Detailed CAYENNE MPG across all years is available for those interested in the model’s evolution.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2025 Porsche Cayenne GTS Coupe at $3,200. This figure is calculated based on an assumed 15,000 miles driven per year, split between city and highway driving, and using national average fuel prices. For a vehicle of this caliber and performance, $3,200 annually represents a minor consideration for its target demographic. Buyers of the Cayenne GTS Coupe typically have significant disposable income, and this fuel expenditure is easily absorbed into their overall vehicle operating budget. It’s part of the cost of ownership for a high-end luxury performance SUV, and it aligns with expectations for vehicles in this class. Compared to the vehicle’s purchase price, insurance, and maintenance, the annual fuel cost is a consistent, but not prohibitive, line item.

Real-world expectations

Expect real-world fuel economy for the 2025 Cayenne GTS Coupe to closely mirror the EPA estimates, with a heavy emphasis on driver behavior. If you’re regularly tapping into that 500-horsepower V8, burying the accelerator and reveling in the intoxicating exhaust note, you’ll see numbers closer to the lower end of the spectrum, possibly even dipping below 16 MPG in spirited city driving. Porsche vehicles, especially the GTS variants, are built to be driven hard, and their drivers often do just that. Conversely, a disciplined driver, using the automatic start-stop system (when active) and maintaining a conservative foot on the throttle, might occasionally exceed the EPA combined rating, particularly on primarily highway runs. The adaptive cylinder deactivation system, which can shut down cylinders under light load, also contributes to efficiency when conditions allow, particularly at cruising speeds.

How it compares

The 2025 Cayenne GTS Coupe positions itself firmly in a competitive landscape of high-performance luxury SUVs, where fuel economy is generally a secondary concern to power and handling. Consider its rivals: The Mercedes-AMG GLE 53 Coupe, with its inline-six mild-hybrid powertrain, delivers 20 MPG combined (18 city/23 highway). While slightly more frugal, it also offers less power than the GTS. The BMW X6 M Competition, a direct competitor in terms of V8 power and performance, typically comes in around 17 MPG combined (15 city/20 highway), making the Cayenne GTS’s 18 MPG combined rating quite competitive within its segment. The Audi RS Q8, another V8-powered powerhouse, also hovers around 16-17 MPG combined. The Cayenne GTS holds its own, demonstrating that its blend of performance and engineering doesn’t necessarily come with a disproportionate fuel penalty compared to its direct V8-powered peers. Buyers comparing these vehicles are weighing acceleration figures, chassis dynamics, and brand preference far more than a single MPG point difference.

Tips to maximize efficiency

Even with a performance-oriented vehicle like the Cayenne GTS Coupe, there are ways to slightly improve fuel economy. Smooth acceleration and braking, rather than aggressive inputs, will significantly reduce fuel consumption, especially around town. Try to anticipate traffic flow to minimize unnecessary stops and starts.

Use the automatic start-stop system whenever possible. This feature, designed to shut off the engine when the vehicle is stationary, can noticeably reduce fuel use in congested urban environments. Ensure it’s enabled in your vehicle settings.

Maintain proper tire pressure. Under-inflated tires increase rolling resistance, forcing the engine to work harder. Check your tire pressure regularly and keep it at the manufacturer’s recommended levels for optimal efficiency and handling.

Engage the “Normal” or “Comfort” driving mode when performance isn’t a priority. These modes typically dull throttle response and optimize gear shifts for economy rather than maximum acceleration, making a difference on longer, less demanding drives.

Minimize excess weight in the vehicle. While not a dramatic change, removing unnecessary items from the trunk or cabin reduces the load on the engine, contributing to marginally better fuel economy over time, particularly for frequent short trips.