23 MPG combined is acceptable for the 2015 Porsche 911 Carrera 4 with the 3.4L engine and automatic transmission, but you’re likely buying this car for its surgically precise steering, tenacious all-wheel-drive grip, and the thrill of a naturally aspirated flat-six engine. Fuel economy is a secondary concern.

City and highway performance

The EPA estimates 20 MPG in the city and 27 MPG on the highway for this 911. The city figure reflects urban driving, where the engine idles or accelerates from a standstill. The highway number shows this car’s relaxed cruising ability at higher speeds, assuming you resist the urge to dip into the power band. The Carrera 4’s all-wheel-drive system adds weight and complexity, which impacts fuel economy compared to its rear-wheel-drive version.

Annual fuel cost

The EPA estimates an annual fuel cost of $2,500 for this 911. This is based on driving 15,000 miles per year and using the national average fuel price for premium gasoline, which this car requires. Real-world fuel costs will vary depending on driving habits, type of driving, and local fuel prices. Consider this estimate as a benchmark, not a guarantee.

Real-world expectations

Drivers in congested city environments will likely see figures close to or below the EPA’s 20 MPG estimate. Those who primarily use the 911 for longer highway trips, and who don’t constantly exploit the engine’s performance, could exceed the 27 MPG highway figure. The “S” model with its more powerful engine will tend to show lower fuel economy with even slight spirited driving. Aggressive acceleration, frequent use of Sport or Sport Plus modes, and extended idling will all negatively impact fuel consumption. The 911 encourages spirited driving, and resisting that temptation takes discipline.

How it compares

Compared to other sports cars, the 2015 911 Carrera 4’s MPG is competitive, but not the best. For example, the similarly priced 2015 BMW M4 coupe with its turbocharged inline-six engine achieves an EPA-estimated 17 MPG city and 26 MPG highway. The Jaguar F-Type V6 S manages around 20 MPG combined. Even other 911 variants display differing fuel economy, find 911 MPG across all years to compare other years. The Carrera 4 balances performance and efficiency, but other cars in the same class can be more or less efficient.

Tips to maximize efficiency

Gentle acceleration is the easiest way to save fuel. The 3.4L flat-six is responsive, but avoid flooring it unless necessary. Smooth acceleration will keep the revs down and minimize fuel consumption.

Anticipate traffic flow and avoid abrupt braking. Maintaining a consistent speed and anticipating traffic lights allows you to minimize unnecessary acceleration and braking. This is important in stop-and-go city driving, where frequent acceleration and braking can reduce fuel efficiency.

Ensure your tires are properly inflated and aligned. Underinflated tires increase rolling resistance, which reduces fuel economy. Regularly check your tire pressure and keep them inflated to the recommended levels, as listed on the door jamb sticker or in the owner’s manual. Also, ensure your wheels are aligned, as misaligned wheels can increase rolling resistance.

Reduce unnecessary weight in the car. Carrying extra weight requires the engine to work harder, which reduces fuel efficiency. Remove any unnecessary items from the trunk and passenger compartment. While a few pounds won’t make a huge difference, every bit helps.

Consider using the Porsche’s automatic start/stop function carefully. While designed to save fuel at stop lights and in traffic, it may not always be the most efficient option in very congested situations. Assess traffic conditions and enable or disable the system based on whether you anticipate frequent, short stops or longer periods of idling. You can find all Porsche fuel economy data on our site.