20 MPG combined won’t win any fuel efficiency awards, but for the 2018 Porsche Cayenne with the 3.6L V6, it represents a balance. This isn’t a vehicle purchased for outright fuel efficiency; it’s a Porsche, meaning performance and driving experience are important. The Cayenne buyer wants the prestige, the handling, and the practicality of a mid-size SUV, and they’re willing to accept relatively modest fuel economy to get it.

City and highway performance

The EPA estimates for the 2018 Cayenne 3.6L are 18 MPG in the city and 24 MPG on the highway. These numbers reflect stop-and-go driving and sustained high-speed cruising, respectively. The city figure is impacted by the Cayenne’s weight and the inherent inefficiency of accelerating from a standstill. The highway figure is more respectable, owing to the smooth-shifting eight-speed automatic transmission and decent aerodynamics for a vehicle of its size. This Porsche is well-engineered, so it will reliably deliver these numbers out on the road. The key is to avoid pushing the engine unnecessarily.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2018 Porsche Cayenne 3.6L at $2,900. This figure is based on driving 15,000 miles per year, with 45% of those miles driven in the city and 55% on the highway. It also assumes fuel prices based on the national average when the EPA testing was conducted, so your actual costs may vary depending on local fuel prices and your individual driving habits. Consider this a benchmark figure to compare against other vehicles, as well as your own potential Cayenne driving patterns.

Real-world expectations

While the EPA provides a standardized testing methodology, real-world fuel economy often deviates. Aggressive driving, heavy traffic, and the use of features like air conditioning can all decrease fuel efficiency. Cayenne owners who frequently exploit the vehicle’s performance capabilities should expect figures closer to the city estimate, even on mixed driving cycles. Conversely, those who prioritize smooth acceleration and consistent speeds on the highway might see slightly better than the 24 MPG highway rating. Remember that the Cayenne is a performance vehicle, so the temptation to use that performance comes with a fuel cost. Learn more about CAYENNE MPG across all years.

How it compares

The 20 MPG combined rating positions the 2018 Cayenne 3.6L within the realm of other performance-oriented SUVs. The BMW X5 xDrive35i, a close competitor, boasts a similar combined rating of 20 MPG, while the Mercedes-Benz GLE 350 manages slightly better, at 21 MPG combined. The Acura MDX SH-AWD, another popular choice, achieves 22 MPG combined, prioritizing a more fuel-conscious driving experience. These small differences matter to some. However, the Cayenne buyer often prioritizes driving dynamics and brand cachet over marginal fuel savings. For those very focused on MPG, the Cayenne S E-Hybrid offered significantly better fuel economy in that model year, with its plug-in hybrid powertrain. Check out all Porsche fuel economy data to see how the Cayenne ranks within the wider Porsche lineup.

Tips to maximize efficiency

The Cayenne’s naturally aspirated V6 engine is responsive, but it benefits from smooth inputs. Avoid sudden acceleration and hard braking, which waste fuel. Anticipate traffic flow and maintain a consistent speed whenever possible. The onboard trip computer provides real-time fuel consumption data, allowing you to adjust your driving style accordingly. Pay attention to this meter periodically.

The Cayenne’s eight-speed automatic transmission is designed for both performance and efficiency. Experiment with the different driving modes. “Normal” prioritizes fuel economy, while “Sport” and “Sport Plus” modes hold gears longer and provide quicker throttle response, at the expense of MPG. Select Normal mode if you are looking for better fuel economy.

Tire pressure plays a critical role in fuel efficiency. Ensure your tires are inflated to the recommended pressure, which can be found on the driver’s side doorjamb or in the owner’s manual. Underinflated tires increase rolling resistance, reducing fuel economy and accelerating tire wear. Check your tire pressure regularly, especially during temperature changes.

Excess weight impacts fuel consumption. Remove any unnecessary items from the cargo area and passenger compartment. A lighter vehicle requires less energy to accelerate and maintain speed. Consider how items in your vehicle affect this. It matters more than you think.

Regular maintenance is essential for optimal fuel economy. Ensure the engine is properly tuned and that all fluids are at the correct levels. Replace air filters as recommended to maintain optimal airflow. A well-maintained Cayenne will run more efficiently and reliably.