20 MPG combined: that’s the EPA’s figure for the 2015 Audi S7 4.0L 8-cyl, and it’s a number that won’t necessarily scare away its target buyer. The S7 isn’t about squeezing every last mile from a gallon. It’s about effortless performance wrapped in advanced design. This is a car for those who appreciate the finer things and aren’t afraid to indulge in a bit of V8-powered fun. Fuel efficiency is a consideration, yes, but it’s balanced against a driving experience that few other cars can match. If you want to compare all Audi fuel economy data, there it is, but keep in mind the S7 is special.

City and highway performance

The EPA numbers break down to 17 MPG in the city and 27 MPG on the highway. The city figure, while not stellar, reflects the reality of stop-and-go traffic draining the tank of a 4.0-liter V8 engine. The S7’s engine is a complex piece of machinery, with cylinder deactivation designed to improve efficiency, but those systems can only do so much when repeatedly accelerating from a standstill. The highway number is more respectable, and on long cruises, cylinder deactivation has more opportunities to kick in, allowing the S7 to loaf along using only half of its cylinders. The aerodynamic shape also helps reduce drag and further improve fuel economy at higher speeds. However, a heavy right foot will quickly negate any gains made by these technologies. The S7’s immense power is always tempting to unleash.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2015 Audi S7 at $2,900. This figure is based on driving 15,000 miles per year and using national average fuel prices. Remember that your actual fuel costs may vary depending on your driving habits, the type of fuel you use, and where you live. If you primarily drive in the city or have a lead foot, you can expect to spend more than this estimate. If you do a lot of highway driving and are gentle on the throttle, you might be able to get closer to the EPA’s highway MPG figure and lower your annual fuel costs.

The $2,900 figure provides a useful benchmark for comparing the S7’s fuel costs to those of other vehicles in its class.

Real-world expectations

While the EPA numbers provide a useful comparison tool, many drivers find that their real-world fuel economy differs somewhat from these figures. The S7’s fuel economy is highly dependent on driving style. A driver who enjoys the car’s performance will likely see fuel economy numbers closer to the city estimate, or even lower. A driver who adopts a more relaxed and fuel-conscious approach could potentially exceed the EPA’s highway estimate. Tire pressure, ambient temperature, and the type of fuel used can also influence real-world fuel economy. Keep these factors in mind when evaluating the S7’s fuel efficiency and track your fuel consumption to get a more accurate picture of your personal fuel costs.

How it compares

In the world of performance sedans, the S7’s fuel economy places it in a specific position. A similarly equipped BMW 550i from the same year achieves a nearly identical 20 MPG combined. The Mercedes-Benz E550, another close competitor, is similar as well. This illustrates that high levels of performance from a gasoline engine inherently come at the cost of fuel efficiency. A Lexus GS 350, while not nearly as powerful, manages around 23 MPG combined. The S7 buyer doesn’t cross-shop the GS 350. They understand what they give up in fuel economy for the thrill of a turbocharged V8. For a broader view, you can explore S7 MPG across all years, and see how this range of vehicles have managed fuel economy.

Tips to maximize efficiency

Keep your tires properly inflated. The S7’s recommended tire pressures are listed on a sticker inside the driver’s side door jamb. Underinflated tires increase rolling resistance, which hurts fuel economy. Regularly check your tire pressure, especially during temperature changes.

Use the S7’s Drive Select system wisely. In “Efficiency” mode, the car adjusts engine and transmission settings to prioritize fuel economy. It may not be the most exhilarating driving experience, but it can make a noticeable difference on longer trips.

Anticipate traffic flow and avoid hard acceleration and braking. The S7’s potent engine is responsive, but every burst of acceleration burns fuel. Smooth and consistent driving will help stretch your gas mileage.

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

Consider using premium fuel. While not strictly required, the S7’s engine is designed to perform optimally on premium gasoline. Although premium fuel will increase the price you pay at the pump, it could lead to better performance and fuel economy and a cleaner running engine.