16 MPG combined? Some drivers simply won’t care. Anyone considering a 2015 Audi A8 L with its powerful 6.3-liter, twelve-cylinder engine probably isn’t worried about saving money on gas. This isn’t about efficiency; it’s about transporting important people in comfort with strong acceleration. The A8 L 6.3 is a statement, and that statement doesn’t include concern for gas prices.

City and highway performance

The EPA estimates 13 MPG in the city and 22 MPG on the highway for this A8. The city figure reflects the fuel consumption of a large, luxurious sedan with a massive engine in stop-and-go traffic. The highway number is impressive when you consider the engine’s potential. The A8 L 6.3 is designed to cruise at high speeds with minimal effort, and even at 75-80 mph, the engine works easily. Passing other vehicles is easy, contributing to a surprisingly relaxed high-speed experience. Of course, heavy acceleration will reduce the MPG figure.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2015 Audi A8 L 6.3 at $3,600. This calculation is based on driving 15,000 miles per year, with 55% of those miles driven in the city and 45% on the highway, using national average fuel prices. For this vehicle’s target customer, $3,600 is probably a small part of their annual budget. However, even wealthy drivers should understand the factors that affect this cost. Driving habits and fuel prices can significantly change the actual yearly cost.

Real-world expectations

While the EPA figures provide a standardized benchmark, real-world MPG depends on driving style and conditions. Someone who often uses the engine’s power will likely see figures below the EPA estimates. Alternatively, a driver who mainly uses the car for long highway trips and accelerates gently might achieve slightly better numbers. Colder temperatures tend to reduce fuel economy because cold air is denser, and warming up the engine requires extra fuel. Tire pressure also affects fuel economy, as lower pressure increases rolling resistance and reduces fuel economy. Keeping all tires at the recommended PSI will help.

How it compares

Compared to other high-performance luxury sedans, the A8 L 6.3’s fuel economy is predictably poor. The Mercedes-Benz S63 AMG, another V8-powered car from the same era, achieves similar figures (around 16 MPG combined). Some may find all Audi fuel economy data a little disappointing. Compared to the V12-powered BMW 760Li from the same year, which gets around 15 MPG combined, the A8 L 6.3 is close. Buyers in this market prioritize performance and exclusivity over saving gas, but a difference in MPG could influence a decision. If lower fuel costs are a minor concern, other A8 trims, such as the 3.0T, offer better mileage while still providing a luxurious experience. See the range of A8 MPG across all years to understand the trade-offs.

Tips to maximize efficiency

Fuel economy might not be important to A8 L 6.3 owners, but there are ways to reduce fuel consumption. Avoid aggressive acceleration and hard braking, as these habits significantly increase fuel use. The A8’s advanced driver assistance systems, such as adaptive cruise control, can help maintain a consistent speed and distance from other vehicles, which can improve efficiency on long highway trips.

Make sure your A8 L 6.3 is properly maintained. Regular oil changes and air filter replacements can improve engine performance and fuel economy. See your owner’s manual for the recommended maintenance schedule.

Consider using the Audi Drive Select system to choose a more fuel-efficient driving mode when maximum performance isn’t needed. The “Comfort” or “Efficiency” modes will adjust the engine and transmission settings to prioritize fuel savings.

Plan your routes to avoid stop-and-go traffic when possible. Constant acceleration and braking consume more fuel than maintaining a steady speed. Using a navigation system with real-time traffic updates can help you find alternative routes.

Remove unnecessary weight from the vehicle. Extra cargo in the trunk or backseat can reduce fuel economy, especially during city driving. Keeping the car as light as possible will help its efficiency, even if only a little.