21 MPG combined isn’t going to win any hypermiling awards, but that’s not the point with the 2015 Porsche Panamera 4S. This is a performance sedan disguised as a luxury GT, a machine built for devouring miles at speed, and fuel economy is a secondary consideration for its clientele. Owners prioritize the intoxicating sound of the 3.0L twin-turbo V6, the all-weather grip of the all-wheel-drive system, and the sheer driving pleasure that Porsche engineers have so expertly baked into the Panamera’s DNA. For them, 21 MPG is an acceptable compromise.

City and highway performance

The EPA estimates suggest 18 MPG in the city and 26 MPG on the highway. The city figure represents stop-and-go driving, showcasing the toll that constant acceleration and braking takes on fuel consumption, even with the assistance of the seven-speed PDK transmission. The 26 MPG highway rating is more palatable, revealing how the Panamera 4S can deliver reasonable efficiency when cruising at a steady speed. This higher figure is attainable thanks to the engine’s ability to deliver strong torque at relatively low RPMs, meaning less throttle input is required to maintain speed.

Annual fuel cost

The EPA estimates an annual fuel cost of $2,750 for the 2015 Porsche Panamera 4S. This figure is calculated based on driving 15,000 miles per year, with a mix of city and highway driving, using national average fuel prices which are constantly in flux. Clearly, those who drive more aggressively, or live in areas with higher fuel costs, will likely exceed this estimate. Understand that this is a standardized figure, meant for comparison purposes, and individual results can vary significantly. But note, this expense is already accounted for in the budget of those who purchase a Panamera.

Real-world expectations

While the EPA provides a standardized benchmark, real-world fuel economy often deviates. Expect to see figures close to the EPA estimates if you prioritize efficiency and adopt a smooth driving style. However, the Panamera 4S is designed to be enjoyed, and indulging in its performance capabilities will inevitably lead to lower MPG. Some owners average slightly below the combined EPA estimate in mixed driving conditions. Aggressive acceleration, frequent use of Sport mode, and extended idling can all negatively impact fuel economy. Keep in mind that the Panamera’s performance is noticeably improved when using the highest octane fuel available.

How it compares

Compared to its rivals, the 2015 Panamera 4S lands in the middle of the pack. A similarly equipped BMW 550i xDrive, with its 4.4L V8, delivers around 19 MPG combined. A Mercedes-Benz CLS550 4MATIC achieves roughly the same. The Audi A7 3.0T offers slightly better economy at around 24 MPG combined, but sacrifices some driving engagement in the process. For those prioritizing fuel efficiency without abandoning the luxury sedan segment, you can view all Porsche fuel economy data to compare, or check the PANAMERA MPG across all years. This comparison highlights the tension: buyers often weigh the Panamera’s performance characteristics against competitors’ offerings that may lean further into comfort or fuel economy, while still offering luxurious amenities.

Tips to maximize efficiency

Maintaining proper tire inflation is critical for maximizing fuel economy in any vehicle, but especially in a performance sedan like the Panamera 4S. Check your tire pressures regularly and inflate them to the manufacturer’s recommended levels. Underinflated tires increase rolling resistance, which reduces fuel efficiency and negatively impacts the vehicle’s handling characteristics.

Anticipate traffic flow and avoid unnecessary stop-and-go driving. Maintain a steady speed whenever possible to minimize fuel consumption. The Panamera’s responsive engine and well-tuned chassis make it easy to adjust your driving style to optimize fuel efficiency without sacrificing safety or enjoyment.

Limit the use of Sport and Sport Plus modes, as they hold gears longer and optimize the engine for maximum performance at the expense of fuel economy. Normal mode provides a good balance of performance and efficiency for everyday driving. Use Sport mode sparingly when you want to fully experience the Panamera’s capabilities.

Minimize idling time, as a stationary engine still consumes fuel. If you anticipate being stopped for more than a minute, turn off the engine. Modern vehicles like the Panamera 4S are designed to restart quickly and efficiently, making it easy to conserve fuel in stop-and-go situations.

Regular maintenance, including oil changes and air filter replacements, is essential for maintaining optimal engine performance and fuel efficiency. Follow the manufacturer’s recommended maintenance schedule to ensure your Panamera 4S runs smoothly and efficiently for years to come.