17 MPG combined won’t impress any Prius driver, but that’s not the point of the 2024 Porsche Cayenne S. Buyers of this strong SUV aren’t primarily motivated by fuel efficiency. They want a Porsche, with all the performance, handling, and prestige the badge implies, and many accept the 4.0-liter V8’s thirst for fuel.

City and highway performance

The EPA estimates the Cayenne S 4.0L V8’s fuel economy at 15 MPG in the city and 21 MPG on the highway. These figures reflect the engine’s power output and the vehicle’s curb weight, necessary components of its performance. The eight-speed automatic transmission contributes to better efficiency than a traditional automatic, but cannot fully mitigate the fuel consumption of a powerful, naturally aspirated engine moving a substantial vehicle. The Cayenne S is built to deliver thrilling acceleration and confident handling, and that performance comes at a cost.

Annual fuel cost

The EPA calculates the annual fuel cost for the 2024 Porsche Cayenne S 4.0L V8 at $3,400. This figure is based on driving 15,000 miles per year, using a blend of city and highway driving, and assumes the current national average fuel price. This is an estimate, as individual fuel costs will vary significantly based on local fuel prices, driving habits, and the proportion of city versus highway miles driven. More aggressive drivers, or those predominantly driving in stop-and-go traffic, can expect to exceed this figure considerably.

Real-world expectations

While the EPA estimates provide a baseline, real-world fuel economy for the Cayenne S 4.0L V8 can fluctuate. Factors such as driving style, traffic conditions, and even tire pressure can impact actual MPG. Owners who prioritize performance and frequently use the engine’s full potential will likely see figures closer to the city estimate, or even lower. Conversely, drivers who adopt a more conservative driving style and spend more time on the highway may achieve something closer to the 21 MPG highway figure. Expect a range, and be prepared to adjust your expectations accordingly.

How it compares

The Cayenne S isn’t alone in its class. The BMW X5 M60i, with its turbocharged V8, achieves around 17 MPG combined, mirroring the Porsche’s number exactly. The Mercedes-Benz GLE 53 AMG manages slightly better, at around 20 MPG combined, owing in part to its mild-hybrid system and smaller engine displacement. Even moving slightly upmarket, the Range Rover Sport with its various engine options delivers numbers that can be better or worse depending on the engine selected. For many prospective buyers, this isn’t a head-to-head competition on pure efficiency; it’s about balancing luxury, performance, and practicality. You can see CAYENNE MPG across all years on our site.

Tips to maximize efficiency

While fuel economy might not be the primary goal of a Cayenne S owner, there are several strategies to get slightly better MPG. Avoid aggressive acceleration and hard braking. The Cayenne S’s powerful engine can tempt drivers into spirited driving, but gentle throttle inputs and gradual braking can reduce fuel consumption.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Regularly check your tire pressure and inflate them to the manufacturer’s recommended levels, found on the doorjamb.

Reduce unnecessary weight. Hauling around extra cargo adds to the vehicle’s load, impacting fuel economy. Remove any unnecessary items from the trunk or cargo area to lighten the load and improve efficiency. Consider the weight of aftermarket wheels and tires, as the unsprung mass significantly impacts fuel efficiency.

Use the highest recommended octane fuel. The 4.0-liter V8 is a high-compression engine designed to run optimally on premium fuel. Using lower octane fuel can reduce performance and potentially damage the engine over time. Check out all Porsche fuel economy data for more information.

When possible, use cruise control on the highway to maintain a consistent speed and avoid fluctuations in throttle input. This can help get better gas mileage, especially on long trips. Resist the temptation to pass unnecessarily; smooth, consistent driving is more efficient.