29 MPG combined is a respectable figure for the 2015 Audi A7 quattro 3.0L, especially the S8 variant. Let’s be clear: no one buys the S8 expecting Prius-like efficiency. They buy it for the intoxicating surge of its supercharged V6, the opulent interior, and the sleek, coupe-like profile that distinguishes it from every other sedan. The fuel economy is simply a fact of life, an acceptable compromise for the blend of performance and luxury this car delivers.

City and highway performance

The EPA estimates for the 2015 Audi A7 S8 provide a clear picture of its fuel consumption. Around town, you can expect 24 MPG, reflecting the toll of stop-and-go traffic on the supercharged engine. The relatively heavy curb weight, due to Audi’s strong construction and all-wheel-drive system, doesn’t help in city driving either. However, on the open highway, the A7 S8 shines, achieving a notable 38 MPG. This high number is partially attributable to the well-tuned automatic transmission with its tall overdrive gears, helping the engine relax at cruising speeds.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2015 Audi A7 S8 at $1,900. This figure is calculated based on driving 15,000 miles per year, with a set percentage allocated to city and highway driving, using the national average fuel price. Keep in mind that this is merely an estimate, and your actual fuel expenses will depend on your individual driving habits, the type of fuel you use (premium is recommended), and fluctuations in gas prices.

Real-world expectations

While the EPA estimates provide a useful baseline, it’s crucial to understand that your real-world fuel economy may vary. Aggressive driving habits, frequent use of the sport driving mode, and extensive idling can all significantly decrease fuel efficiency. Conversely, mindful driving, gentle acceleration, and consistent highway cruising can help you get closer to, or even exceed, the EPA’s estimates. The A7 S8, with its powerful engine and inherent eagerness, can tempt drivers into accelerating vigorously, and that temptation directly impacts your fuel bill.

How it compares

Compared to its competitors, the 2015 Audi A7 S8 lands in a competitive, but not class-leading, position. The BMW 535i xDrive, offering similar power and all-wheel-drive capability, achieves an EPA-estimated 25 MPG combined. The Mercedes-Benz CLS400 4MATIC, another stylish competitor, reports a combined 24 MPG. While the A7 S8 holds a slight edge, the differences are not massive; buyers in this segment are typically more concerned with performance, luxury features, and design than a few MPG. You can view all Audi fuel economy data on our site. If you are considering different years of this model, you can view A7 MPG across all years.

Tips to maximize efficiency

Maintain proper tire inflation. The A7 comes standard with relatively low profile performance tires. They look fantastic, contributing both to the athletic driving feel and the visual appeal of the car, but only properly inflated tires allow the car to roll most efficiently. Check your tire pressures regularly and inflate them to the door-jamb sticker specification.

Anticipate traffic flow. The A7 S8’s reliable brakes are great, but using them represents wasted energy. By anticipating traffic conditions and avoiding abrupt acceleration and braking, you can preserve momentum and reduce fuel consumption.

Use the drive select modes thoughtfully. The A7 offers various driving modes, including an “Efficiency” mode designed to optimize fuel economy. Experiment with this mode on long highway drives to see if it suits your driving style and helps improve your MPG figures. Note that the fuel economy in this mode will be higher but driving fun will be lower.

Minimize idling. Idling consumes fuel without covering any distance. If you anticipate being stationary for more than a minute, it’s best to turn off the engine.

Keep up with maintenance. A well-maintained engine runs more efficiently. Follow the recommended maintenance schedule in your owner’s manual, including regular oil changes, spark plug replacements, and air filter replacements. This preventative care is just as important as the rest of these tips.