22 MPG combined is not going to win any awards, but it’s the reality of driving a long-wheelbase luxury sedan like the 2023 Audi A8 L 3.0L 6-cyl. This car isn’t about chasing Prius-like efficiency numbers, it’s about effortless power, a quiet ride, and a cabin that cocoons its occupants in exceptional comfort. Owners in this segment prioritize those qualities, understanding that a compromise on fuel economy is part of the equation. They value the prestige, the space, and the advanced technology that the A8 L delivers, and they are willing to pay for it, both at the dealership and at the pump.

City and highway performance

The EPA estimates for the A8 L 3.0L are 19 MPG in the city and 28 MPG on the highway. The city figure reflects the stop-and-go driving conditions where the car’s weight and the need to repeatedly accelerate take their toll. However, the 28 MPG highway rating is more respectable. Here, the A8 L’s engine settles into a relaxed cruise, aided by the well-calibrated eight-speed automatic transmission (S8 designation, not to be confused with the high-performance S8 model) and the car’s inherently slippery aerodynamics. On long road trips, drivers can expect to see figures closer to, and sometimes even above, that 28 MPG rating by using cruise control and employing a gentle right foot.

Annual fuel cost

The EPA calculates that the annual fuel cost for the 2023 Audi A8 L 3.0L is $2,650. This figure is based on driving 15,000 miles per year and using national average fuel prices. Individual costs will vary depending on local fuel prices and driving habits. However, this provides a clear benchmark for potential owners during the purchasing process. While more economical options exist in the luxury car segment, buyers choose the A8 L understanding these associated expenses. Refer to all Audi fuel economy data if you’re looking for something different.

Real-world expectations

While EPA estimates provide a standardized basis for comparison, real-world fuel economy can vary considerably depending on driving style, traffic conditions, and terrain. A lead-footed driver in a congested urban area will likely see significantly lower numbers than someone who primarily drives on open highways. The A8 L’s onboard computer provides real-time and trip-based fuel consumption data, allowing drivers to monitor their efficiency and adjust their driving habits accordingly. Expect the A8’s figure to fall somewhere in between the EPA ratings, skewing higher if you are gentle and live in a rural area. Remember, this car is tuned for graceful power and not necessarily optimum efficiency.

How it compares

Competitors to the A8 L, such as the BMW 740i, Lexus LS 500, and Mercedes-Benz S500, offer comparable fuel economy. The BMW 740i, with its 3.0L inline-six, achieves a similar 25 MPG combined. The Lexus LS 500, equipped with a 3.5L V6, lands slightly lower at 21 MPG combined. The Mercedes-Benz S500, boasting a 3.0L inline-six with mild hybrid assist, posts 24 MPG combined. These differences are relatively marginal, and the purchasing decision is often based on factors beyond fuel economy, such as styling preferences, brand loyalty, and specific features. For those looking into other model years, check out A8 MPG across all years.

Tips to maximize efficiency

Anticipate traffic flow and avoid sudden acceleration and braking. The A8 L’s large size and substantial weight mean that it requires more energy to get moving and to slow down. Smooth, consistent driving will significantly improve fuel economy.

Use the A8 L’s drive select modes. The “Efficiency” mode optimizes the engine and transmission settings for maximum fuel efficiency. While it may slightly reduce throttle response, it can make a noticeable difference on longer journeys.

Ensure that the tires are properly inflated. Underinflated tires increase rolling resistance and reduce fuel economy. Check the tire pressure regularly and inflate them to the recommended level, which can be found on the driver’s side doorjamb.

Avoid unnecessary idling. Shut off the engine when stopped for more than a minute or two. Modern engines are designed to restart quickly and efficiently, and idling consumes fuel without contributing to forward motion.

Minimize the use of accessories such as air conditioning and heated seats when they are not needed. These accessories place an extra load on the engine, slightly reducing fuel efficiency. However, prioritize comfort and safety first.