The 2025 Audi A6 quattro with its 3.0L six-cylinder engine achieves a combined fuel economy of 25 MPG, a figure that will likely satisfy its target demographic. This isn’t a car designed to rewrite efficiency benchmarks. It’s a comfortable, all-weather capable, subtly elegant sedan engineered to deliver effortless performance and a refined driving experience. While a hybrid car driver might scoff, the A6 owner appreciates a balance, prioritizing brisk acceleration and all-wheel drive traction alongside reasonable fuel consumption.

City and highway performance

The EPA estimates an A6 quattro owner can expect 22 MPG in city driving and 30 MPG on the highway. The city figure reflects the A6’s weight and the energy required to repeatedly accelerate from a standstill. Stop-and-go traffic will naturally impact fuel economy, while its responsive engine and smooth-shifting seven-speed automatic transmission (AM-S7) make urban maneuvering enjoyable. On the open road, the A6 cruises comfortably. Its aerodynamic design and carefully calibrated gearbox contribute to the 30 MPG highway rating, making long-distance journeys relatively efficient for a vehicle of this size and power.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2025 Audi A6 quattro at $2,300. This figure is based on driving 15,000 miles per year, using a blend of city and highway driving conditions reflective of the EPA’s testing cycle, and assumes national average fuel prices. Your personal fuel expenses will vary based on your driving habits and local fuel costs, but $2,300 serves as a standardized benchmark for comparing the A6’s running costs against other vehicles. The calculation assumes the vehicle uses regular unleaded gasoline, as premium fuel is not specifically required by Audi for this engine.

Real-world expectations

While the EPA ratings provide a standardized measure, real-world fuel economy often differs. Aggressive driving, frequent short trips, and continuous use of the air conditioning can all negatively impact MPG. Owners who prioritize smooth acceleration, anticipate traffic flow, and use cruise control on the highway can likely achieve numbers close to the EPA estimates. The A6’s onboard trip computer provides real-time and average fuel consumption data, allowing drivers to monitor their efficiency and adjust driving habits accordingly. Cold weather also tends to reduce MPG.

How it compares

The A6’s fuel economy positions it competitively within its class. The BMW 540i xDrive, a direct rival, also boasts a 3.0L six-cylinder engine and all-wheel drive, achieving an EPA-estimated 26 MPG combined, a slight edge over the A6. The Mercedes-Benz E450 4MATIC mirrors the A6 with a 25 MPG combined rating, despite also employing a mild-hybrid system. For some buyers, the A6’s styling and interior design might outweigh the difference of a single MPG point. All Audi fuel economy data, including the A6, is readily available. The Volvo S90 B6 AWD, with its turbocharged and supercharged 2.0L engine, offers a comparable 26 MPG combined. The A6 MPG across all years is a useful metric to consult while shopping.

Tips to maximize efficiency

Take advantage of the Audi Drive Select system. Choosing the “Efficiency” mode will optimize engine and transmission settings for improved fuel economy. This often involves earlier upshifts and reduced throttle response. It’s a subtle change that can add up over time, without sacrificing too much of the A6’s inherent performance.

Ensure your tires are properly inflated. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Check your tire pressures regularly and inflate them to the recommended levels, usually found on a sticker inside the driver’s side door jamb. This simple step makes a difference.

Avoid unnecessary idling. If you anticipate being stopped for more than a minute or two, turn off the engine. Modern engines are designed to restart quickly and efficiently, and restarting consumes less fuel than idling for extended periods. This is especially relevant in urban environments.

Smooth and consistent driving is key. Avoid abrupt acceleration and hard braking. Anticipate traffic flow and maintain a steady speed whenever possible. This reduces unnecessary energy expenditure and helps maximize fuel economy. The A6’s adaptive cruise control can be helpful for maintaining consistent speeds on the highway.

Reduce weight wherever possible. Remove unnecessary items from the trunk and cabin. Excess weight puts extra strain on the engine and reduces fuel efficiency. While a few pounds may not seem significant, they accumulate over time and contribute to increased fuel consumption.