28 MPG combined is a perfectly respectable figure for the 2015 Audi A8 L 3.0T, but its significance depends on understanding the car’s purpose. This isn’t a commuter car; it’s a long-wheelbase luxury sedan engineered for comfortable cross-country trips and pampering its occupants. The typical A8 L owner values a smooth ride, a quiet cabin, and advanced technology more than saving every last mile from a gallon of premium fuel.

City and highway performance

The EPA estimates for the 2015 A8 L 3.0T are 24 MPG in the city and a more impressive 36 MPG on the highway. The city figure reflects stop-and-go traffic and the engine’s need to frequently overcome the car’s weight. The highway number shows the powertrain’s efficiency at sustained speeds. The supercharged 3.0-liter V6 paired with the eight-speed automatic transmission allows for relaxed and efficient cruising, keeping the engine within its optimal efficiency range. This is where the A8 L excels, easily covering ground while maintaining decent fuel economy.

Annual fuel cost

The EPA estimates that the annual fuel cost for the 2015 Audi A8 L 3.0T will be approximately $2,000. This is based on driving 15,000 miles per year and using national average fuel prices for premium gasoline, which Audi recommends for best performance and engine life. While $2,000 is not a small amount, owners in this segment are usually less sensitive to fuel costs than drivers of more affordable vehicles.

Real-world expectations

While the EPA estimates provide a baseline, real-world fuel economy will vary based on driving habits and conditions. Aggressive acceleration, frequent hard braking, and prolonged idling will negatively affect fuel efficiency. Factors such as weather, tire pressure, and the of air conditioning can also play a role.

Drivers who primarily operate the A8 L in urban environments can expect numbers closer to the city MPG estimate, while those who frequently take longer highway trips should be able to achieve figures closer to or even exceeding the 36 MPG highway rating. Regular maintenance, including oil changes and tire rotations, will also help ensure good gas mileage.

How it compares

Among full-size luxury sedans, the 2015 Audi A8 L 3.0T is competitive in fuel efficiency. The BMW 740Li, with its similar 3.0-liter turbocharged inline-six, delivers comparable figures, around 22 MPG city and 32 MPG highway. The Mercedes-Benz S550, with its more powerful V8 engine, gets approximately 17 MPG city and 26 MPG highway. A hybrid like the Lexus LS 600h offers better city fuel economy in the low 20s, but its highway MPG is often similar to or slightly lower than the A8 L. For buyers considering a plug-in hybrid, the Porsche Panamera S E-Hybrid combines performance and efficiency, but it is expensive. Exploring all Audi fuel economy data will give you additional context. You can also examine A8 MPG across all years to see how the numbers have changed. The A8 L balances performance and efficiency well for its class.

Tips to maximize efficiency

Driving in the Audi’s “Efficiency” mode can greatly improve fuel economy, especially on longer trips. This mode adjusts throttle response, transmission shift points, and the climate control system to prioritize saving gas. Learn how this mode works and turn it on when you can.

Pay attention to tire pressure. Underinflated tires create more rolling resistance, which makes the engine work harder and burn more fuel. Regularly check your tire pressure and inflate them to the recommended levels, which can be found on the driver’s side doorjamb or in the owner’s manual.

Minimize idling. If you expect to be stationary for more than a minute or two, turn off the engine. Modern engines are designed to restart easily and efficiently, so the fuel saved by turning off the engine will quickly make up for the small amount used to restart it. This is relevant in cities with frequent traffic stops.

Anticipate traffic flow and drive smoothly. Avoid sudden acceleration and hard braking. Smooth, consistent driving minimizes wasted energy and maximizes fuel efficiency. Maintaining a steady speed and allowing the car to coast when safe can make a difference over time.