The 2021 Audi RS 5 Sportback achieves 21 MPG combined. This isn’t going to win any awards for vehicles with lower fuel costs, and nobody buying this car expects it to. The RS 5 Sportback isn’t about maximizing MPG; it’s about blending strong performance with everyday practicality, a compromise buyers accept. It’s a four-door coupe that can handle backroads as easily as it handles a grocery run, and the fuel economy reflects that.

City and highway performance

The EPA estimates for the RS 5 Sportback break down to 18 MPG in the city and 25 MPG on the highway. The city number reflects the stop-and-go nature of urban driving, where the turbocharged engine is constantly working to get the car moving from a standstill. The highway number is more palatable, showcasing the efficiency achievable when cruising at a steady speed. Remember, the 2.9L V6 is under the hood, ready to unleash its power for passing. That power is always available, and using it will impact your fuel consumption.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2021 Audi RS 5 Sportback at $2,750. This calculation is based on driving 15,000 miles per year and using the EPA’s estimate of average fuel prices. Your actual fuel costs will vary depending on your driving habits, the type of fuel you use, and gas prices in your area. Some RS 5 owners, particularly those who frequently engage in spirited driving, will likely see a fuel bill significantly higher than $2,750.

Real-world expectations

While the EPA provides a standardized estimate, real-world driving conditions can impact those numbers. Aggressive acceleration, frequent braking, and extended idling will all decrease fuel economy. Conversely, using cruise control on the highway and practicing smooth driving techniques can help you get closer to the EPA’s highway estimate. Expect the reality to fluctuate depending on how and where you drive. Don’t be surprised to see numbers varying from the high teens to the low twenties in mixed driving conditions, which is the the cost for a car with this level of performance.

How it compares

The fuel economy of the RS 5 Sportback is predictable given its performance. The BMW M340i xDrive, for example, manages a slightly better 25 MPG combined thanks to its milder performance tuning. The Mercedes-AMG C43 Sedan, another direct competitor, comes in closer with 22 MPG combined. Buyers cross-shopping these vehicles are typically prioritizing driving experience and overall vehicle dynamics over fuel savings; differences of a few MPG are unlikely to sway their decision. You can also view RS MPG across all years to see if you could benefit from other model years.

Tips to maximize efficiency

One often overlooked factor is tire pressure. Ensure your tires are properly inflated to the manufacturer’s recommended pressure. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Regularly check your tire pressure, especially during temperature changes.

Avoid unnecessary idling. Modern engines don’t need to warm up for extended periods, especially in moderate climates. If you’re going to be stopped for more than a minute, it’s more efficient to turn off the engine. This is especially true in stop-and-go city traffic where idling can contribute significantly to fuel consumption.

Anticipate traffic flow and maintain a consistent speed whenever possible. Smooth acceleration and gradual braking are key. Avoid sudden bursts of speed and harsh stops, as these actions waste fuel. Reading the road ahead and adjusting your speed accordingly can improve your MPG.

Minimize aerodynamic drag. Remove any unnecessary items from the roof rack or cargo carrier. Even small changes to the vehicle’s aerodynamics can impact fuel economy, especially at higher speeds. The sleek profile of the RS 5 Sportback is designed to minimize drag; don’t negate that advantage with aftermarket accessories.

Use the Audi Drive Select system wisely. If you’re not planning on pushing the car to its limits, select a more efficient driving mode like “Comfort” or “Efficiency.” These modes typically adjust the engine mapping, transmission shift points, and steering feel to prioritize fuel savings. Even in the most efficient mode, the RS 5 Sportback has hidden performance to unlock.

You can find all Audi fuel economy data on our website.