22 MPG combined isn’t going to win any fuel economy contests, but for the 2015 Audi A8 3.0L, it’s an acceptable cost. This isn’t a car purchased by penny-pinchers; it’s a statement of success, a mobile office, and a haven of quiet on four wheels. Owners prioritize effortless power, a supremely comfortable ride, and cutting-edge technology over squeezing every last mile from a gallon of fuel. They seek prestige and performance, and know that comes at a price.

City and highway performance

The A8’s 19 MPG city rating reflects the stop-and-go reality of urban driving, where its smooth-shifting automatic transmission is a welcome companion. The 3.0L supercharged V6 provides ample torque for confident acceleration from any speed, allowing drivers to effortlessly navigate city traffic with minimal throttle input. On the highway, the A8 truly shines. Its 29 MPG rating is achievable with a light foot, the reward for which is a calm, quiet, and stable experience at cruising speeds. The long wheelbase and meticulously engineered suspension contribute to exceptional ride quality, making long journeys a pleasure rather than a chore. This isn’t an economy car; it’s a luxury sedan built for long-distance travel, and it performs admirably in that role.

Annual fuel cost

The EPA estimates that the annual fuel cost for the 2015 Audi A8 3.0L will be $2,650. This figure is based on driving 15,000 miles per year, with 55% of those miles driven in the city and 45% on the highway, using the national average fuel price at the time of calculation. Of course, individual results may vary depending on driving habits, location, and fuel prices. Consider this a benchmark, not a guarantee. Drivers who frequently find themselves pushing the A8’s capabilities on twisty back roads will see this number increase, while those with predominantly highway commutes and a gentle driving style could potentially see it decrease.

Real-world expectations

While the EPA figures provide a useful baseline, real-world fuel economy often deviates from the official estimates. Aggressive acceleration, frequent short trips, and extended idling will all negatively impact MPG. However, the A8’s engine management system and reasonably efficient supercharged V6 help maintain relatively consistent fuel economy, even in less-than-ideal driving conditions. Expect a realistic combined MPG figure in the low to mid-20s for most drivers. Check out A8 MPG across all years for a deeper dive.

How it compares

Compared to its competitors, the 2015 Audi A8 3.0L occupies a middle ground in terms of fuel economy. The BMW 740i, with its similar inline-six engine configuration, achieves a comparable 22 MPG combined. The Mercedes-Benz S550, with its more powerful (and thirstier) V8, is rated at 20 MPG combined. The Lexus LS 460, known for its smooth and reliable powertrain, achieves 19 MPG combined. Buyers in this segment aren’t solely focused on fuel economy, but the A8’s figures represent a reasonable balance between performance and efficiency. Potential buyers should consult all Audi fuel economy data to see how other models and trims compare.

Tips to maximize efficiency

Use “S” mode sparingly. The A8’s “Sport” mode sharpens throttle response and holds gears longer, which is great for spirited driving but detrimental to fuel economy. Unless you’re actively trying to extract maximum performance, leaving the transmission in “Drive” will yield better MPG.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Regularly check and maintain the recommended tire pressure, which can be found on a sticker inside the driver’s side doorjamb.

Anticipate traffic flow. Smooth acceleration and deceleration are key to maximizing fuel efficiency. By anticipating traffic conditions and avoiding sudden braking or acceleration, you can minimize wasted energy and improve your MPG.

Limit idling. Excessive idling consumes fuel without covering any distance. If you anticipate being stopped for more than a minute or two, it’s more efficient to turn off the engine. The A8’s quick restart makes this a convenient way to conserve fuel.

Service the vehicle according to the manufacturer’s recommendations. Regular oil changes, air filter replacements, and other scheduled maintenance items ensure that the engine is running at peak efficiency, which directly translates to improved fuel economy.