23 MPG combined won’t lead the class, but for the 2018 Audi A6 quattro 3.0L, it’s an expected trade-off. This isn’t a hyper-efficient hybrid; it’s a comfortable and quick car in the mid-size luxury sedan segment, designed for drivers who prioritize performance and all-weather confidence over saving gas. The A6 quattro isn’t trying to be a Prius. It delivers athleticism and refinement that resonates with its target audience.

City and highway performance

The EPA estimates 20 MPG in the city and 29 MPG on the highway, figures that reflect the A6’s driving dynamics. The city number reflects the energy needed to move a car of this size through stop-and-go traffic, while the highway rating highlights how well the engine and eight-speed automatic transmission perform when cruising. These numbers aren’t the best, but they communicate the reality of a powerful six-cylinder engine working with a full-time all-wheel drive system. The quattro system, while enhancing grip and stability, adds weight and frictional losses that impact fuel consumption. The 29 MPG highway number is achievable with a light foot.

Annual fuel cost

The EPA estimates that the 2018 Audi A6 quattro 3.0L will have an annual fuel cost of $2,500. That figure is based on driving 15,000 miles per year and the EPA’s estimate of a national average fuel price. Keep in mind that this is an estimate. Your actual fuel costs will vary depending on how many miles you drive, how aggressively you drive, and the prevailing fuel prices in your area. Drivers who primarily stick to city driving will likely exceed this estimate, while those who spend more time on the open highway may find they spend less. The $2,500 figure provides a benchmark for budgeting, but individual results will differ.

Real-world expectations

While EPA estimates provide a standardized baseline, real-world fuel economy often differs. Owners of the 2018 A6 quattro 3.0L report figures close to the EPA estimates, but variations occur. Driving style plays a big role. Hard acceleration and braking will negatively impact fuel economy, dropping it below the stated 20 MPG city/29 MPG highway. By contrast, a relaxed driving style, using the car’s momentum and avoiding the gas pedal, can help achieve numbers closer to, or even slightly above, the EPA’s estimates. Traffic conditions, terrain, and tire inflation can also influence fuel consumption. These ratings represent an average, and individual results will vary.

How it compares

The 2018 Audi A6 quattro 3.0L exists in a competitive segment, and fuel economy is one factor buyers consider. The BMW 540i xDrive, another all-wheel drive, six-cylinder luxury sedan, offers similar performance but achieves an EPA-rated 23 MPG combined, mirroring the A6. The Mercedes-Benz E400 4MATIC, offering a comparable driving experience, posts an EPA-rated 22 MPG combined; in line with the A6. Outside the German brands, the Lexus GS 350 AWD manages 22 MPG combined according to the EPA. These slight differences in EPA estimates often come down to engine tuning and transmission programming. Someone shopping A6 MPG across all years may also consider a different powertrain in the given year. For the A6 buyer, all-wheel drive is often a priority because it provides sure-footedness in inclement weather. These buyers may accept slightly lower mileage for better traction.

Tips to maximize efficiency

Use the Audi Drive Select system. Selecting “Efficiency” mode will optimize engine and transmission settings for better fuel economy. The car will prioritize higher gears and reduce throttle response, encouraging a more gentle driving style. Sport mode is tempting, but save it for when you want the car’s performance.

Monitor your tire pressure regularly. Properly inflated tires reduce rolling resistance, improving fuel economy. Check the sticker on the driver’s side doorjamb for the recommended tire pressure for your A6, and check the pressure when the tires are cold for the most accurate reading. Even a few PSI below the recommended level can increase fuel consumption.

Anticipate traffic flow and drive smoothly. Avoid sudden acceleration. By looking ahead and maintaining a consistent speed, you can reduce the amount of energy wasted on unnecessary acceleration and deceleration. This is important in city driving, where stop-and-go traffic can significantly impact fuel economy. Cruise control helps on the highway.

Minimize unnecessary weight. Carrying excessive cargo adds weight to the vehicle, requiring the engine to work harder, and consuming more fuel. Remove any items you don’t need to improve fuel efficiency. Even small items add up. Rooftop cargo carriers affect MPG too, by reducing the vehicle’s aerodynamic efficiency.

Stay up-to-date on routine maintenance. A well-maintained engine runs more efficiently. Follow the recommended service intervals in your owner’s manual, including oil changes, air filter replacements, and spark plug maintenance. A clean engine is a fuel-efficient engine. More all Audi fuel economy data can be found on this site.