For the 2025 Audi A8 quattro 3.0L 6-cyl, 22 MPG combined is where luxury, performance, and fuel consumption meet. This number won’t excite Prius owners, nor should it. Instead, it’s a practical trade-off for buyers who want a refined driving experience, cutting-edge technology, and confidence in all weather conditions, all of which the A8 provides. These owners have probably weighed choices and know what they’re giving up for flagship-level comfort and status.

City and highway performance

The A8’s 20 MPG city rating shows what to expect in stop-and-go city traffic. The 3.0L six-cylinder’s smooth power and the automatic transmission’s smooth shifts lessen the impact on the driving experience. On the open road, the A8 cruises with ease, getting 26 MPG on the highway. This is a respectable number for a large sedan allowing for comfortable long trips without too many gas stops. The quattro all-wheel-drive system helps with traction and handling, but it also slightly lowers fuel efficiency compared to rear-wheel-drive competitors.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2025 Audi A8 quattro 3.0L 6-cyl at $2,650. This is based on driving 15,000 miles per year with a mix of city and highway driving, using the national average fuel price. It’s a good way to compare the A8’s running costs to other cars. Your own fuel costs will change based on how you drive, local fuel prices, and how much city versus highway driving you do.

Real-world expectations

EPA estimates give a standard comparison, but real-world fuel economy can differ. Driving hard, taking lots of short trips, and idling for a long time will lower fuel efficiency. On the other hand, accelerating gently, driving at steady highway speeds, and keeping up with vehicle maintenance can help you get the EPA estimates or even better. The A8’s trip computer shows real-time and average fuel economy, so drivers can watch their consumption and adjust how they drive.

How it compares

The A8 is in a competitive area, facing rivals that try different ways to get fuel efficiency. The BMW 740i, using a similar 3.0L inline-six, gets about 25 MPG combined, which is a bit better than the A8. The Mercedes-Benz S500, which has a more powerful engine, is closer to the A8 at around 23 MPG combined. Some buyers may think about plug-in hybrid options like the BMW 750e xDrive; however, its fuel economy changes a lot based on charging. For someone thinking about the A8, these small MPG differences often matter less than interior design, technology, and brand reputation. The A8 buyer accepts its fuel economy for the unique feel and driving experience that Audi provides.

Tips to maximize efficiency

Accelerate gently to save fuel in the A8. Avoid quick starts and hard stops because they use up a lot of gas. Predict traffic and drive at a smooth, steady speed when you can.

Make sure your tires have the right amount of air. You can find the recommended pressure on a sticker inside the driver’s side doorjamb. Tires with low air pressure increase rolling resistance, which lowers fuel efficiency. Checking your tire pressure regularly is a simple way to save gas.

Don’t idle. If you’re going to be stopped for more than a minute, turn off the engine. Modern engines start again quickly and easily, and idling wastes gas.

Use the A8’s drive mode settings. Choose “Efficiency” mode to set the engine and transmission for the best fuel economy. This mode usually makes the throttle less responsive and shifts gears sooner to save fuel. Consider exploring A8 MPG across all years to learn more about fuel efficiency over past models.

Keep your car in good shape. Getting regular oil changes, replacing air filters, and tuning up the engine can make it more fuel-efficient. An engine that is well-maintained runs more smoothly, using less fuel. Always see all Audi fuel economy data to ensure that you’re making the right choice for your needs.