25 MPG combined isn’t going to win any hypermiling contests, but it’s an acceptable figure for the 2018 Audi S3. This isn’t a car purchased by penny-pinchers. The S3 buyer wants a premium experience, turbocharged thrust, and all-weather confidence, and they’re willing to pay a premium at the pump to get it. Fuel economy is a consideration, but it’s not the primary one. Performance and prestige are more important, making this a reasonable compromise for the driving experience it delivers.

City and Highway Performance

The EPA estimates the 2018 Audi S3 will achieve 22 MPG in the city and 28 MPG on the highway. This split reflects how the car performs. In urban environments, the turbocharged 2.0L engine is constantly working to overcome stop-and-go traffic, which reduces some of its efficiency. The seven-speed dual-clutch transmission (AM-S7) works diligently to keep the engine performing well, but frequent acceleration and braking cycles take their toll. On the open highway, however, the S3 settles into a more relaxed cruise, allowing the direct injection and carefully calibrated gearing to maximize fuel efficiency. The relatively low curb weight for an all-wheel-drive luxury vehicle also helps its highway MPG.

Annual Fuel Cost

The EPA estimates the annual fuel cost for the 2018 Audi S3 at $2,300. This figure is based on driving 15,000 miles per year, with a blend of city and highway driving, and using the national average fuel price at the time of calculation. Keep in mind that this is just an estimate, and your actual fuel costs may vary depending on your driving habits and local fuel prices. For instance, consistent use of premium fuel, as recommended for optimal performance, will increase your real-world expenses beyond this estimate. Similarly, if you live in a region with higher fuel costs, your annual expenditure will naturally be greater than $2,300. To see all Audi fuel economy data, browse our archives.

Real-World Expectations

While the EPA estimates provide a useful benchmark, real-world fuel economy often differs. The S3 is a car that encourages enthusiastic driving. The readily available torque from the turbocharged engine and the engaging handling tempt drivers to explore its performance. Frequent use of the “Sport” mode and aggressive acceleration will reduce fuel economy.

Drivers who prioritize a smooth and efficient driving style, adhering to speed limits and anticipating traffic flow, are more likely to achieve figures closer to the EPA estimates. Those who enjoy the S3’s performance may see their MPG dip slightly below the stated combined figure. See the S3 MPG across all years.

How it compares

The 2018 Audi S3 is unique in the performance sedan market, and its fuel economy reflects its position. A direct competitor, the BMW M240i xDrive, offers similar performance and all-wheel drive but achieves a slightly lower 24 MPG combined. The Mercedes-AMG CLA 45, another performance-oriented rival, also comes in around 23 MPG combined. On the more efficient end, the Acura ILX achieves 29 MPG combined, but it lacks the S3’s all-wheel-drive capability and performance. A Volkswagen Golf R shares the S3’s engine and drivetrain, and its fuel economy is about the same at 25 MPG combined. The comparison matters because it highlights the trade-off buyers make. If you want the S3’s blend of luxury, performance, and all-weather capability, its fuel economy is competitive within that segment.

Tips to maximize efficiency

The S3’s driving mode selector offers an “Efficiency” mode designed to optimize fuel consumption. Engaging this mode adjusts throttle response, transmission mapping, and even climate control settings to minimize fuel usage. While it may slightly dampen the car’s performance, it can make a noticeable difference on longer drives, especially highway cruising.

Proper tire inflation is important for both safety and fuel economy. Check your tire pressures regularly and ensure they are within the recommended range specified on the doorjamb sticker. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. A small investment in a tire pressure gauge can pay dividends in fuel savings.

Aggressive acceleration and hard braking are major contributors to decreased fuel economy. Practice smooth and progressive acceleration, anticipating traffic conditions and maintaining a steady speed whenever possible. Avoiding sudden stops and starts will not only save fuel, but also reduce wear and tear on your brakes and tires.

Consider shedding unnecessary weight from the vehicle. Removing items from the trunk or rear seats reduces the overall load the engine has to carry. While the impact may seem minimal, every pound counts, especially during city driving. A lighter car is a more efficient car.