20 MPG combined isn’t winning any fuel economy awards, but for the 2020 Porsche Cayenne S with its 2.9L twin-turbo V6, it’s an acceptable number. The Cayenne S isn’t bought for its frugality, it’s bought for its blistering performance, its precision handling, and the prestige of the Porsche crest. Cayenne S buyers prioritize driving experience far above maximizing miles per gallon, and this specific powerplant offers a sweet spot in the Cayenne lineup: plenty of power without the thirst of the Turbo models.

City and highway performance

The EPA breaks down that 20 MPG combined figure into 18 MPG in the city and 22 MPG on the highway. The city figure reflects the reality of urban driving, where the twin-turbo V6 spends more time idling and accelerating than maintaining a steady speed. That 22 MPG highway number, while not stellar, demonstrates the engine’s efficiency when cruising. The Cayenne S’s well-calibrated eight-speed automatic transmission helps, keeping the engine in its most efficient range. But let’s be honest: resisting the urge to tap into the V6’s power on the open road requires restraint few Cayenne S drivers possess.

Annual fuel cost

According to the EPA, the estimated annual fuel cost for the 2020 Porsche Cayenne S is $2,900. This is based on driving 15,000 miles per year and using the national average fuel price. This is a significant expense, but it needs to be considered alongside the vehicle’s price, insurance, and running costs. Someone spending upwards of $80,000 on a performance SUV probably isn’t overly concerned with a few extra hundred dollars at the pump each year. They are likely aware of the cost and have factored it into their budget. A good next step is to review CAYENNE MPG across all years to determine if previous iterations of the car are more efficient.

Real-world expectations

The EPA’s figures are a good starting point, but real-world fuel economy will vary depending on driving style, road conditions, and even the weather. Drivers who frequently push the Cayenne S’s performance will see lower numbers than the EPA estimates. Those who drive more conservatively and spend time on the highway might achieve slightly better fuel economy. A realistic expectation for most Cayenne S drivers is somewhere within 17-23 MPG in mixed driving. Premium fuel is required, impacting the overall cost of ownership.

How it compares

Compared to other performance SUVs, the 2020 Porsche Cayenne S is in the middle for fuel economy. The BMW X5 M50i, with its V8 engine, delivers around 16 MPG combined, making the Cayenne S look efficient. The Audi SQ5, with its supercharged V6, manages around 21 MPG combined. The Mercedes-AMG GLE 43 achieves figures similar to the Porsche. Fuel economy isn’t necessarily the only purchase consideration, but buyers are likely aware of the competition and the trade-offs between performance and efficiency. They might also be more interested in the Porsche’s sharper handling and driving experience than fuel savings. Comparing all Porsche fuel economy data can also provide deeper insight.

Tips to maximize efficiency

Fuel economy might not be the Cayenne S driver’s top priority, but there are still ways to improve it. Avoid aggressive acceleration and hard braking because these actions strain the engine and consume more fuel. Use the car’s driving modes; selecting “Normal” or “Eco” mode will prioritize efficiency over performance.

Ensure that your tires are properly inflated. Underinflated tires increase rolling resistance, which reduces fuel economy. Check your tire pressure regularly and inflate them to the manufacturer’s recommended levels, which can be found on a sticker inside the driver’s side doorjamb.

Reduce weight in the vehicle. Excess cargo adds weight, which requires the engine to work harder and consume more fuel. Remove items from the trunk or passenger compartment that you don’t need regularly.

Plan your routes to avoid stop-and-go traffic, where possible. Consistent cruising speeds on the highway offer the best fuel economy. Use navigation apps to identify potential congestion and find alternative routes.

Consider the long term. Regular car maintenance can greatly improve your MPG and extend the life of your car. Engine issues can greatly affect fuel economy.