17 MPG combined is a perfectly justifiable number for the 2021 Porsche Panamera Turbo S ST 4.0L 8-cyl, because nobody buying this car is prioritizing fuel efficiency. This is a 620-horsepower all-wheel-drive luxury performance wagon, and its existence is based on shattering lap times and delivering breathtaking acceleration, not sipping fuel. The typical buyer is a successful professional or entrepreneur who demands both supercar performance and the practicality of a hatchback. They likely have other vehicles in their garage that can deliver better fuel economy when needed and consider the Panamera Turbo S ST a tool for specific, adrenaline-fueled purposes.

City and highway performance

The EPA estimates for the Panamera Turbo S ST break down to 15 MPG in the city and 21 MPG on the highway. The city figure reflects the reality of stop-and-go traffic, where the powerful V8 engine is constantly working against the car’s considerable weight. The highway number is more respectable, thanks to the smooth-shifting eight-speed automatic transmission (AM-S8) and the engine’s ability to cruise comfortably at higher speeds. However, even on the highway, aggressive acceleration and a heavy right foot will quickly see those numbers fall. The eager responsiveness that makes this car so thrilling also makes it a challenge to drive efficiently.

Annual fuel cost

According to the EPA, the annual fuel cost for the 2021 Porsche Panamera Turbo S ST is $3,400. This figure is based on driving 15,000 miles per year, with 55% of those miles driven in the city and 45% on the highway, using national average fuel prices. Keep in mind that this is merely an estimate, and your actual fuel costs will vary depending on your driving habits, local fuel prices, and the type of fuel you use. This Porsche demands premium fuel, which invariably costs more.

Real-world expectations

While the EPA provides a useful baseline, real-world fuel economy for the Panamera Turbo S ST can vary significantly. Drivers who spend most of their time in congested urban environments and frequently exploit the car’s performance capabilities should expect to see fuel economy numbers closer to the city estimate, possibly even lower. Conversely, drivers who primarily use the car for longer highway journeys and maintain a more moderate driving style might achieve figures closer to, or even slightly above, the highway estimate. However, exceeding the EPA combined figure of 17 MPG consistently will be a challenge for most owners.

How it compares

Compared to its competitors, the Panamera Turbo S ST’s fuel economy lands about where you’d expect. The Mercedes-AMG GT 63 S 4-Door Coupe, another high-performance hatchback, achieves a similar 15 MPG city and 21 MPG highway. The Audi RS7, while slightly more practical, posts an EPA-estimated 15 MPG city and 22 MPG highway. Even a seemingly more efficient choice such as the BMW M5 Competition comes in at 15 MPG city and 21 MPG highway. These comparisons underscore that performance at this level inherently requires fuel consumption, and compromises on efficiency are the price of admission. See Panamera MPG across all years. And for a broader look, here’s all Porsche fuel economy data.

Tips to maximize efficiency

Embrace smooth acceleration and braking. The Panamera Turbo S ST’s immense power is intoxicating, but gentle inputs on the throttle and brakes will significantly improve fuel economy. Avoid aggressive acceleration from a standstill and anticipate traffic flow to minimize hard braking.

Use the car’s driving modes. The Panamera Turbo S ST offers various driving modes, including a “Normal” or “Comfort” mode that prioritizes lower fuel costs. Selecting this mode will alter the engine mapping and transmission behavior to optimize fuel consumption during everyday driving.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, which in turn decreases fuel economy. Regularly check your tire pressure and inflate them to the recommended levels specified in the owner’s manual or on the driver’s side door jamb.

Minimize idling. Idling consumes fuel without covering any distance. If you anticipate being stationary for more than a minute or two, turn off the engine. Modern engines are designed to restart quickly and efficiently, and the fuel savings from avoiding prolonged idling can add up over time.

Consider the route. Avoid congested routes and prioritize highway driving when possible. Maintaining a consistent speed on the highway is generally more fuel-efficient than navigating stop-and-go traffic in the city.