23 MPG combined isn’t going to win any fuel economy contests, but consider what delivers that figure: the 2023 Audi S5 Cabriolet. This isn’t a hybrid commuter; it’s a stylish, open-top performance car with a strong 3.0-liter turbocharged V6 engine and quattro all-wheel drive. The S5 Cabriolet appeals to drivers who prioritize driving pleasure, responsive acceleration, and detailed design over outright efficiency. They understand the trade-off and are willing to accept it for the experience this car provides.

City and highway performance

The EPA estimates the S5 Cabriolet at 21 MPG in the city and 28 MPG on the highway. These numbers realistically reflect the S5’s driving character. Around town, the engine’s 349 horsepower and the automatic transmission’s eagerness to downshift contribute to brisk acceleration from stoplights. The stop-and-go nature of urban driving prevents the V6 from operating at its most efficient. However, the highway figure is more encouraging. Cruising at a steady speed allows the drivetrain to settle into higher gears, maximizing fuel economy. Achieving that 28 MPG figure requires a conscious effort to maintain a consistent speed and avoid excessive acceleration.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2023 Audi S5 Cabriolet at $2,500. This figure is based on driving 15,000 miles per year and using national average fuel prices, which often change. Your actual fuel costs will vary based on your driving habits, the type of fuel you use, and local fuel prices. Drivers with a heavier foot or those who predominantly drive in the city will likely exceed this estimate. Those who primarily use the S5 for longer highway trips and prioritize fuel efficiency might spend less.

Real-world expectations

While the EPA provides a standardized benchmark, real-world fuel economy always varies. S5 Cabriolet drivers often report figures that are plus or minus a few MPG from the official numbers. Aggressive driving, frequent short trips, and carrying extra weight can all negatively impact fuel consumption. On the other hand, driving conservatively, optimizing tire pressure, and minimizing aerodynamic drag can improve efficiency. Factors like weather conditions (cold temperatures impact engine efficiency) also play a role. Understanding these variables is critical for managing expectations and accurately budgeting for fuel costs. If you’re curious about how the S5 has varied over time, take a look at the S5 MPG across all years.

How it compares

The S5 Cabriolet competes in a small niche of luxury convertible performance cars, and its fuel economy falls roughly in line with its rivals. The BMW 440i Convertible, with its 3.0-liter inline-six, achieves a similar 25 MPG combined. The Mercedes-AMG C43 Cabriolet, although packing more horsepower, lands in the same ballpark around 22 MPG combined. These differences are relatively small and often secondary to factors like styling, features, and driving dynamics for buyers in this segment. Fuel economy is a consideration, but it rarely outweighs the desire for a luxurious and sporty open-air experience. For a broader perspective, you can explore all Audi fuel economy data.

Tips to maximize efficiency

Take advantage of the Audi Drive Select system. The “Efficiency” mode optimizes engine and transmission settings for maximum fuel economy. It may dull throttle response slightly, but it can make a noticeable difference on longer drives. Experiment with different modes to find the best balance between performance and efficiency for your driving style.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, which forces the engine to work harder and consume more fuel. Check your tire pressure regularly and inflate them to the recommended levels, which are typically found on a sticker inside the driver’s side doorjamb. A tire pressure monitoring system is useful, but manual checks are still essential.

Avoid unnecessary idling. Modern engines are designed to be efficient when running, and idling wastes fuel without covering any distance. If you’re stopped for more than a minute or two, it’s generally better to turn off the engine. Restarting the engine consumes a small amount of fuel, but it’s usually less than the amount wasted during prolonged idling.

Use cruise control on the highway. Maintaining a consistent speed minimizes unnecessary acceleration and deceleration, leading to smoother and more efficient driving. Cruise control helps you avoid unconsciously speeding up, which can significantly impact fuel economy at higher speeds. Be mindful of traffic conditions and adjust your speed accordingly.