The 2016 Audi A8 L with the 6.3L 12-cylinder engine gets 16 MPG combined. This vehicle isn’t purchased for fuel efficiency. It’s a flagship sedan, stretched for rear passenger comfort, and powered by an engine that prioritizes power and refinement above all. Its buyers are often leaders and individuals for whom the cost of premium gasoline is a minor concern. For them, the A8 L 6.3 embodies understated luxury and delivers serious power with quiet composure.

City and highway performance

EPA estimates for the naturally aspirated 6.3L W12 engine show a difference between city and highway MPG, although within a limited range. In the city, the A8 L achieves 13 MPG, reflecting stop-and-go driving where the engine’s mass has to be repeatedly accelerated. This figure is typical for a large engine in a heavy car. On the open road, the highway MPG improves to 22, showing the engine’s ability to cruise efficiently at a consistent speed. The advanced 8-speed automatic transmission (S8) helps by keeping the engine in its optimal rev range for efficiency. However, frequent acceleration will quickly decrease this highway fuel economy.

Annual fuel cost

According to the EPA, the estimated annual fuel cost for the 2016 Audi A8 L 6.3 is $3,600. This is based on driving 15,000 miles per year, with a mix of city and highway driving, using national average fuel prices at the time of calculation. Actual costs can vary depending on driving habits, local fuel prices, and the ratio of city versus highway miles driven. Super-premium fuel is required for this engine, adding to the cost at each fill-up.

Real-world expectations

While the EPA estimates are a benchmark, real-world fuel economy for the A8 L 6.3 can differ. Drivers who often use the engine’s power will likely see figures closer to the city MPG. However, those who prioritize smooth highway driving may achieve slightly better than the EPA’s 22 MPG rating. The vehicle’s weight, the engine’s displacement, and the standard quattro all-wheel-drive system will affect fuel economy. Expect to spend a lot on fuel with this A8.

How it compares

It’s essential to consider the A8 L 6.3 within its competitive set. A comparable car might be the Mercedes-Benz S65 AMG (when new), which offers power and luxury and got an identical combined 16 MPG from the EPA with its twin-turbo V12. A Bentley Flying Spur is another similar option. For those willing to sacrifice some cylinders for better economy, even an A8 model with the turbocharged V8 engine would likely achieve a combined MPG in the low 20s. For access to all Audi fuel economy data, look here. Those considering this car but not beholden to a specific engine or model year might consider A8 MPG across all years.

Tips to maximize efficiency

While fuel economy is not a primary concern for A8 L 6.3 owners, there are actions to minimize fuel consumption.

Avoid aggressive acceleration and braking. The W12 engine is powerful, but that power constantly will drastically lower fuel economy. Gentle acceleration and braking will help keep fuel consumption in check.

Ensure that your tires are properly inflated. Correct tire pressure reduces rolling resistance, which can improve fuel economy. Check your tire pressure regularly, especially during temperature changes.

Minimize idling. Letting the engine idle consumes fuel without covering any distance. If you expect to be stopped for more than a minute, turn off the engine.

Service your A8 L on time according to the manufacturer’s specifications. A well-maintained engine is efficient. Regular oil changes, air filter replacements, and spark plug maintenance will help optimize fuel economy.