24 MPG combined is acceptable for the 2019 Porsche 911 Carrera 4S. This car isn’t bought for hypermiling. It’s for enthusiasts who want strong performance combined with everyday usability, and a combined figure in the mid-twenties is a reasonable price to pay for that duality. Buyers willing to spend six figures on a German sports car aren’t typically the same people clipping coupons to save a few bucks at the pump. They prioritize the experience, and the 911 delivers. The important thing to understand is where that 24 MPG comes from and how to make the most of it.

City and highway performance

The EPA estimates 21 MPG in the city and 28 MPG on the highway for the 2019 Porsche 911 Carrera 4S equipped with its 3.0L flat-six engine and the automatic (AM-S7) transmission. The city figure reflects stop-and-go traffic, where the engine is constantly accelerating from a standstill. Meanwhile, the highway estimate assumes more consistent speeds with less demand on the engine. These figures are a useful baseline, but they don’t always tell the whole story. Someone who frequently uses launch control at every green light will, find their mileage plummeting well below the 21 MPG city estimate. Conversely, someone who spends most of their time on long highway journeys, using cruise control and anticipating traffic, will likely see numbers closer to, or even exceeding, the 28 MPG highway rating. The all-wheel-drive “4S” designation also has a minor effect compared to the rear wheel drive cars, slightly reducing efficiency.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2019 Porsche 911 Carrera 4S at exactly $2,400 per year. This figure is based on driving 15,000 miles annually, with a mix of city and highway driving that reflects the EPA’s combined MPG rating. It also uses national average fuel prices at the time of calculation, which means this number will fluctuate as gas prices rise or fall. If you drive significantly more or less than 15,000 miles per year, or live in a state with higher or lower fuel costs than the national average, your actual spending will vary accordingly. Therefore, treat $2,400 as an approximation rather than a precise reflection of your individual expenses.

Real-world expectations

While the EPA estimates provide a useful benchmark, real-world fuel economy can vary considerably. Consider driving style, traffic conditions, and even weather conditions. Aggressive acceleration, hard braking, and sustained high speeds will significantly reduce fuel efficiency. Conversely, smooth, consistent driving habits will improve it. Traffic congestion, especially in urban areas, will drag down MPG numbers. Cold weather can also negatively impact fuel economy, as engines are less efficient when cold and winter-blend fuels often contain additives that reduce MPG. Finally, using “Sport” or “Sport Plus” mode frequently will definitely impact fuel economy by holding lower gear longer.

How it compares

The 2019 911 Carrera 4S occupies a unique space in the sports car landscape. A similarly powerful rival, the Mercedes-AMG C63 S Coupe, achieves around 18 MPG combined. Even the four-cylinder Porsche 718 Cayman S manages only 24 MPG combined according to the EPA, about the same as its bigger brother. The BMW M4 Competition, another popular choice in this segment, comes in at around 19 MPG combined. These figures highlight that the 911 4S isn’t necessarily the thriftiest option, but it offers a blend of performance and efficiency compared to other high-performance sports cars. Of course, if fuel economy is a primary concern, you could consider a hybrid sports car, but that would come with a trade-off in terms of character and driving experience. See 911 MPG across all years to compare to other models.

Tips to maximize efficiency

Use the car’s “Normal” driving mode as much as possible. While Sport and Sport Plus modes sharpen throttle response and hold gears longer, they also significantly increase fuel consumption without dramatically improving normal on-road driving. The 911 has more than enough performance in “Normal” mode for everyday driving and even spirited back road excursions.

Be mindful of tire pressures. Underinflated tires increase rolling resistance and reduce fuel efficiency. Check your tire pressures regularly and ensure they are inflated to the manufacturer’s recommended levels, typically found on a sticker inside the driver’s side doorjamb or in the owner’s manual. This is important on a performance car like the 911, where maintaining optimal tire pressure is also crucial for handling.

Avoid unnecessary idling. Idling wastes fuel and contributes to emissions. If you’re stopped for more than a minute, turn off the engine. The 911 is equipped with an automatic start/stop system that does this automatically, but you can manually engage it in situations where the system doesn’t activate on its own.

Use cruise control on the highway whenever possible. Maintaining a consistent speed reduces fluctuations in fuel consumption. and avoid aggressive acceleration and braking, as these maneuvers consume significantly more fuel. Anticipate traffic flow and maintain a steady pace to maximize fuel economy.

Consider a Cobb Accessport to optimize your 911’s fuel mapping. Although it is predominantly for performance purposes, a good tuner can also make minor tweaks to the map to offer slightly better fuel mileage during cruising and low-load conditions. Review all Porsche fuel economy data should you be interested in looking into other models.