Driving a 2015 Audi S4 3.0L 6-cyl comes with a fuel economy of 21 MPG combined. This car isn’t usually chosen by those who prioritize fuel efficiency above all else. It’s built for enthusiasts who want a potent, engaging driving experience and are willing to accept average gas mileage for that performance. The S4 offers a good mix of luxury, sportiness, and daily usability, and that trade-off is worth it for many.

City and highway performance

That 21 combined MPG breaks down to an EPA-estimated 18 MPG in the city and 28 MPG on the highway. The city figure is its weak point. Stop-and-go traffic and frequent acceleration use more fuel in a supercharged 3.0-liter V6. The highway number is more respectable, however. Cruising at a steady speed allows the S4 to stretch its legs and show some efficiency. The seven-speed S tronic dual-clutch transmission helps keep the engine in its best range at higher speeds. Your driving style greatly impacts these numbers. A heavy foot will lower your fuel economy in both environments, while a more relaxed approach can give slightly better results.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2015 Audi S4 at $2,750. This is based on driving 15,000 miles per year, with 55% of those miles in the city and 45% on the highway, using current national average fuel prices. This is just an estimate. Your actual fuel costs will change based on your driving habits, the type of fuel you use, and gas prices. If you mainly drive in the city or drive aggressively, expect to spend more than $2,750 annually. If you do a lot of highway driving and drive reasonably, you might save a little.

Real-world expectations

While the EPA gives a standard estimate, real-world fuel economy often differs. Many S4 owners report combined MPG figures close to the EPA’s 21 MPG, but some see slightly lower numbers, especially with fast driving or modifications. The S4 encourages performance, so it’s easy to dip into the boost from the supercharger more often than in a less exciting car. Check online forums and owner reviews for a better idea of what to expect in different driving conditions. Weather also affects fuel economy where colder temperatures and winter tires can lower fuel economy.

How it compares

Among sporty sedans, the 2015 Audi S4’s fuel economy is neither great nor terrible. A direct competitor like the BMW 335i (later 340i) with its turbocharged 3.0-liter inline-six offers similar performance, but often gets slightly better fuel economy, with some models around 22-23 MPG combined. The Mercedes-Benz C400 (later C43 AMG) gives similar performance to the S4, with similar fuel economy numbers. The Cadillac ATS 3.6L V6 rated at 22 MPG combined offers slightly better but comparable performance, with a less refined feel. The S4 buyer wants the whole package: the quattro all-wheel drive, the nice interior, and the Audi look, and accepts the fuel consumption. For all Audi fuel economy data, click here and find out how Audi compares to their competitors. Check S4 MPG across all years to see if fuel economy has changed.

Tips to maximize efficiency

Use the Audi Drive Select system. Try the “Efficiency” mode, which changes throttle response, shift points, and climate control settings to save fuel. It might reduce the car’s performance a little, but it can help with fuel use during daily commutes.

Make sure your tires are inflated right. Underinflated tires increase rolling resistance, making the engine work harder and use more gas. Check your tire pressure often and keep the levels at what your owner’s manual says, since driving a performance car like an S4 can wear tires unevenly if not at the right pressure.

Watch traffic flow and avoid unnecessary accelerating and braking. Keeping a steady speed and using momentum can improve fuel economy, especially in stop-and-go situations. Leave a safe following distance and avoid sudden maneuvers.

Reduce your vehicle’s weight by removing any unnecessary items from your trunk or backseat. Extra weight strains the engine and reduces fuel efficiency. While the S4’s quattro system adds weight, less cargo is a simple way to get better MPG.

Maintain your car regularly. A well-maintained engine runs more efficiently. Keep up with scheduled oil changes, air filter replacements, and spark plug replacements which will ensure good performance and prevent expensive repairs.