24 MPG combined might sound like a penalty for driving a Porsche 911 Targa 4S, but it’s a functional compromise for a car focused on performance and driving pleasure. This isn’t transportation for the masses; it’s engineered to deliver an exhilarating experience, and fuel efficiency is secondary to power, handling, and the thrill that a flat-six engine and open-air driving provide. Owners aren’t primarily motivated by saving money at the pump, they’re driven by a passion for driving.

City and highway performance

The EPA estimates that the 2018 Porsche 911 Targa 4S achieves 21 MPG in the city and 27 MPG on the highway. The city figure reflects urban driving, where the engine’s responsiveness is appreciated but efficiency suffers. The highway number acknowledges the car’s ability to cruise comfortably at higher speeds, using the seven-speed automatic (AM-S7) transmission to optimize fuel consumption when acceleration isn’t needed. Even on the highway, the temptation to use the 3.0-liter twin-turbocharged flat-six is ever-present, which can quickly lower the observed MPG.

Annual fuel cost

According to the EPA, the annual fuel cost for the 2018 Porsche 911 Targa 4S is $2,400. This calculation is based on driving 15,000 miles per year and using national average fuel prices. While this figure provides a baseline, understand that individual driving habits and local fuel costs can significantly impact the amount spent. Someone who frequently uses launch control or primarily drives in city traffic will likely exceed this estimate. A driver who prioritizes smooth acceleration and mostly uses the car for longer highway journeys may see slightly lower annual fuel costs.

Real-world expectations

While the EPA figures offer a standardized comparison, real-world fuel economy often differs. 911 Targa 4S drivers tend to prioritize performance over frugality; the joy of accelerating or driving on winding roads often outweighs the desire to conserve fuel. Achieving the EPA’s 27 MPG highway figure consistently might be challenging. Expect something closer to the combined 24 MPG in everyday driving, or potentially lower if you frequently explore the engine’s powerband. The Targa 4S rewards spirited driving, and that comes at a cost.

How it compares

The 911 isn’t purchased with fuel efficiency as a priority but it’s helpful to consider its peers. A comparable sports car like the Jaguar F-Type R Coupe (supercharged V8) delivers around 18 MPG combined. Even more performance-oriented trims of the Chevrolet Corvette, such as the Z06, hover around 15 MPG combined. The BMW M4 Competition, while a different type of performance car, manages around 19 MPG combined. These comparisons demonstrate that the 911 Targa 4S, despite its performance capabilities, isn’t exceptionally thirsty within its competitive set; read 911 MPG across all years for a broader picture. Its all-wheel-drive system adds weight and complexity that slightly impacts fuel economy compared to rear-wheel drive sports cars, but it also adds all-weather usability and handling prowess, a calculated tradeoff for its target market. Discover all Porsche fuel economy data to see how this model compares to others in the family.

Tips to maximize efficiency

While fuel economy isn’t the primary concern for Targa 4S owners, there are techniques to improve efficiency without sacrificing the driving experience entirely. Avoid aggressive acceleration and braking. The twin-turbo engine responds eagerly to even moderate throttle inputs, so modulating the pedal will help you conserve fuel. Smooth and predictable throttle usage is key.

Use the automatic transmission’s higher gears on the highway. Allowing the car to cruise in seventh gear reduces engine RPMs and improves fuel consumption during sustained highway driving. Resist the urge to frequently downshift for passing; rely on the engine’s generous torque to pull you through.

Ensure your tires are properly inflated. Underinflated tires increase rolling resistance, which forces the engine to work harder and consume more fuel. Check the tire pressure regularly and inflate them to the manufacturer’s recommended specifications, found on the doorjamb sticker.

Minimize idling time. Letting the engine idle for extended periods wastes fuel unnecessarily. If you’re stopped for more than a minute, turn off the engine. The frequent restarts have minimal impact on the engine’s durability compared to the wasted fuel during idling.

Consider using the “Normal” driving mode when appropriate. While the “Sport” and “Sport Plus” modes sharpen throttle response and hold gears longer, they also increase fuel consumption. The “Normal” mode offers a more relaxed driving experience and optimizes the engine for fuel efficiency when maximum performance isn’t required.