A combined fuel economy of 23 MPG isn’t setting any records these days, but it’s a reality most 2021 Audi S4 owners have come to accept. The S4 isn’t about hyper-efficiency; it’s a performance sedan that balances everyday practicality with a healthy dose of turbocharged power. Those who prioritize outright MPG are likely shopping for a different type of vehicle entirely, maybe even browsing all Audi fuel economy data.

City and highway performance

The EPA estimates the 2021 Audi S4 at 20 MPG in the city and 28 MPG on the highway. The city figure reflects the demands of stop-and-go traffic, highlighting the engine’s need to constantly accelerate and decelerate this relatively heavy sedan. The highway number is more respectable, showcasing the 3.0L V6’s ability to cruise efficiently once up to speed. These numbers are achieved thanks to the engine’s turbocharger, direct fuel injection and the S tronic 8-speed automatic transmission that helps keep the engine in its optimal RPM range. The standard Quattro all-wheel-drive system, while enhancing grip and handling, does contribute to a slight reduction in fuel economy compared to front-wheel-drive vehicles. Drivers who frequently find themselves stuck in urban congestion will hover closer to the 20 MPG mark, while those who spend more time on open roads may occasionally exceed the 28 MPG highway estimate. Understanding your typical driving environment is key to gauging what kind of fuel economy you can realistically expect from your S4.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2021 Audi S4 to be $2,500. This calculation is based on driving 15,000 miles per year and using national average fuel prices, which change constantly. This $2,500 figure provides a benchmark for potential owners, allowing them to factor in fuel expenses when considering the overall cost of ownership. Keep in mind that premium fuel is highly recommended for the S4 to achieve optimal performance and efficiency, so you’ll want to plan for the higher cost of that fuel when budgeting.

Real-world expectations

While the EPA provides a standardized test, real-world fuel economy can vary significantly depending on driving habits, traffic conditions, and even weather. Aggressive acceleration, frequent hard braking, and prolonged idling can all negatively impact MPG. The S4’s sporty nature can tempt drivers to push the engine harder, leading to fuel consumption higher than the EPA estimates. Conversely, those who adopt a more conservative driving style and take advantage of the car’s efficient cruising capabilities can often achieve results that are closer to, or even slightly exceed, the EPA figures.

Factors such as tire pressure, proper vehicle maintenance, and even the use of accessories that add weight (like roof racks) can influence fuel economy. The S4’s driver-selectable modes, such as “Comfort” or “Efficiency,” can encourage the transmission to shift earlier and the engine to operate in a more fuel-conscious manner.

How it compares

In the sport sedan segment, the 2021 Audi S4 finds itself surrounded by a mix of competitors, each with its own MPG profile. The BMW M340i, a direct rival, typically achieves around 25 MPG combined. The Mercedes-AMG C43 sedan is typically rated around 22 MPG combined. Another obvious rival, the Genesis G70 3.3T, posts around 20 MPG combined. These minor differences in MPG matter to the buyer cross-shopping these vehicles, especially because they often share other characteristics like price, size, and performance. Potential S4 buyers should carefully analyze their personal driving needs and priorities to determine which model offers the best balance of fuel efficiency and performance. You can also compare this year against the S4 MPG across all years.

Tips to maximize efficiency

Take advantage of the Audi Drive Select system. Selecting the “Efficiency” or “Comfort” mode will optimize the engine and transmission settings for fuel economy, encouraging earlier upshifts and less aggressive throttle response. These settings can make a noticeable difference on long highway drives or in stop-and-go traffic.

Monitor your tire pressure regularly. Underinflated tires increase rolling resistance, forcing the engine to work harder and burn more fuel. Check your tire pressure at least once a month and inflate them to the recommended pressure listed on the sticker inside the driver’s side doorjamb.

Avoid excessive idling. If you’re going to be stopped for more than a minute, turn off the engine. Modern cars are designed to restart quickly and efficiently, and idling wastes fuel unnecessarily.

Drive smoothly and avoid aggressive acceleration and braking. Anticipate traffic flow and maintain a steady speed whenever possible. Rapid acceleration and hard braking consume significantly more fuel than gradual acceleration and deceleration.

Keep up with regular maintenance. A well-maintained engine is an efficient engine. Follow the manufacturer’s recommended maintenance schedule, including oil changes, air filter replacements, and spark plug replacements. These simple tasks can help ensure your S4 is running at its peak efficiency.