19 MPG combined isn’t exactly economical, but that’s not why anyone buys the aggressively styled 2020 Porsche Cayenne S Coupe. It’s a statement vehicle, purchased by those who prioritize driving dynamics, brand cachet, and panache over efficiency. Buyers accept the fuel bill as the cost of entry into the club of high-performance luxury SUVs.

City and highway performance

The EPA estimates suggest 18 MPG in the city and 22 MPG on the highway. The city number reflects stop-and-go driving and the inherent inefficiency of any internal combustion engine constantly accelerating and decelerating. Highway performance, while slightly better, is still relatively low for a modern vehicle. The reason? A potent 2.9L twin-turbocharged V6, producing 434 horsepower. This engine demands fuel to deliver its performance, and the aerodynamic compromises of a coupe-styled SUV don’t help at sustained speeds. The standard eight-speed automatic transmission contributes to performance and refinement, but it isn’t geared for ultimate fuel efficiency. Instead, it prioritizes rapid response and immediate power.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2020 Porsche Cayenne S Coupe at $3,050. This calculation is based on driving 15,000 miles per year, with an assumed even split between city and highway driving, and using the national average fuel price which can vary substantially. This figure provides a useful benchmark for budgeting, but drivers should track their own fuel consumption to obtain a more accurate picture of their individual running costs. Drivers who drive more aggressively, spend more time in city traffic, or live in areas with higher fuel prices will likely exceed this $3,050 estimate.

Real-world expectations

While the EPA figures provide a baseline, real-world fuel economy can vary depending on driving style, traffic, and even weather. Expect to see numbers close to the EPA estimates with careful driving. However, drivers who frequently test the Cayenne S Coupe’s performance will experience lower MPG. Short trips, particularly in cold weather, will also hurt fuel economy. The twin-turbocharged V6 performs best after it’s fully warmed up. The availability of different driving modes such as “Normal,” “Sport,” and “Sport Plus” will also play a role. Choosing Sport or Sport Plus will prioritize performance which results in higher fuel consumption.

How it compares

Compared to its competitors, the Cayenne S Coupe is in the middle regarding fuel economy. The BMW X6 M50i, with its powerful V8 engine, gets 18 MPG combined. The Mercedes-AMG GLE 53 Coupe achieves an EPA-estimated 20 MPG combined. Even the Audi Q8 manages only 19 MPG. Vehicles like the Range Rover Velar offer slightly better fuel economy (21 MPG combined for the P340 engine), but its luxury and performance don’t match the Porsche. Buyers considering these SUVs weigh the compromise of fuel economy for power, performance, and driving engagement. They often find the Cayenne S Coupe’s package the most appealing.

Tips to maximize efficiency

Use the Cayenne S Coupe’s “Normal” driving mode when cruising. This setting optimizes the engine and transmission for fuel efficiency, reducing throttle response and shifting to higher gears sooner.

Avoid aggressive acceleration and braking. The twin-turbo V6 delivers exhilarating performance, but bursts of power will quickly drain the fuel tank. Smooth acceleration and anticipating traffic can improve fuel economy.

Ensure your tires are properly inflated. Under-inflated tires increase rolling resistance, which forces the engine to work harder and consume more fuel. Check your tire pressures regularly and maintain them at the recommended levels, which can be found on the driver’s side doorjamb.

Reduce unnecessary weight. Extra cargo adds weight, which requires more energy to accelerate and maintain speed, impacting fuel efficiency. Remove any items you don’t need from the trunk and passenger compartment.

Consider long-term maintenance. A well-maintained engine runs more efficiently. Regular maintenance, including oil changes, air filter replacements, and spark plug replacements (as per the manufacturer’s recommendations) will contribute to optimal fuel economy. For all Porsche fuel economy data and CAYENNE MPG across all years, be sure to check other FuelEconomyHub.com resources.