Let’s be frank, 22 MPG combined is not the reason anyone buys a 2015 Porsche 911 Carrera 4S. Buyers aren’t cross-shopping this all-wheel-drive sports car with Priuses or even Macans. They are buying a meticulously engineered machine that delivers a singular driving experience, and they’re generally willing to accept compromises elsewhere, including at the pump.

City and highway performance

The EPA estimates the 2015 Porsche 911 Carrera 4S at 19 MPG in the city and 26 MPG on the highway. These figures are directly tied to the car’s mission. In urban environments, stop-and-go traffic and the temptation to exploit the immediacy of the flat-six engine take their toll. On the open road, the aerodynamic efficiency of the 911 combined with the tall gearing of the seven-speed automatic transmission (PDK) allow it to achieve reasonable mileage at sustained highway speeds. The temptation to dip into the prodigious power reserves, however, will always be present, and indulged.

Annual fuel cost

The EPA estimates that the annual fuel cost for the 2015 Porsche 911 Carrera 4S is $2,650. This figure is based on driving 15,000 miles per year, with a roughly 55/45 split between city and highway driving, using national average fuel prices. It’s a benchmark for comparison, but your own fuel costs can vary significantly depending on driving habits, local fuel prices, and the actual number of miles driven each year.

Real-world expectations

The EPA estimates are useful for comparison, but understanding real-world driving habits is critical with a car like the 911. Owners who primarily use the car for weekend drives and spirited backroad excursions will likely see MPG figures at the lower end of the spectrum, possibly even dipping below the city MPG rating.

Those who use it as a daily driver, with a mix of highway commuting and responsible city driving, might achieve numbers closer to or even slightly above the combined rating. However, anyone consistently exceeding the highway MPG figure may be missing the point of owning a 911 altogether.

How it compares

Compared to its rivals, the 2015 911 Carrera 4S occupies an interesting middle ground. A Jaguar F-Type R Coupe with all-wheel drive, for example, boasts significantly more power but pays the price with a lower EPA estimate of 18 MPG combined. The Nissan GT-R isn’t exactly a paragon of efficiency either, with a combined MPG of 19. Both the GT-R and F-Type are aimed squarely at performance buyers, a shopper similarly situated to someone considering the 911.

On the other hand, looking toward a BMW M4 Coupe at 20 MPG combined, the Porsche offers a more balanced driving experience, blending performance with everyday usability.

The 911 buyer accepts a certain fuel cost in exchange for the car’s unique blend of performance, prestige, and daily drivability.

Tips to maximize efficiency

While outright fuel economy isn’t a primary concern for 911 owners, there are still steps you can take to minimize fuel consumption without sacrificing too much driving enjoyment. Avoid aggressive acceleration and hard braking, as the 3.8-liter flat-six is sensitive to throttle input. Smooth, deliberate driving will yield noticeable improvements.

Use the car’s driving modes effectively. The ‘Normal’ mode softens throttle response and encourages earlier upshifts, prioritizing fuel efficiency over outright performance. Reserve ‘Sport’ and ‘Sport Plus’ modes for situations where maximum performance is truly needed, rather than everyday driving.

Ensure that your tires are properly inflated. Correct tire pressure reduces rolling resistance, which in turn improves fuel economy. Check your tire pressures regularly and maintain them at the recommended levels which can be found on the driver’s side door jamb.

Consider the effect of aftermarket modifications. While performance upgrades like exhaust systems and ECU tunes can enhance engine output, they often come at the expense of fuel efficiency. Weigh the benefits of these modifications against their potential impact on MPG.

Keep the vehicle properly maintained. A well-maintained engine runs more efficiently. Follow the manufacturer’s recommended service schedule, including regular oil changes, air filter replacements, and spark plug inspections. You can compare all Porsche fuel economy data here on FuelEconomyHub. And explore 911 MPG across all years.