18 MPG combined won’t win any fuel efficiency awards, but it’s what you get with the 2018 Audi S6 and its intoxicating blend of performance and luxury. This isn’t a car for hypermilers; it’s for those who appreciate effortless acceleration, a finely crafted interior, and understated yet assertive styling. The S6 buyer understands that compromises are inherent, and they willingly trade fuel efficiency for the thrill of a twin-turbo V8 and the status of the four rings.

City and highway performance

The 2018 Audi S6, equipped with its 4.0L 8-cylinder engine and automatic transmission, achieves an EPA-estimated 16 MPG in the city and 24 MPG on the highway. The city figure reflects the stop-and-go realities of urban driving, where the engine spends more time idling or accelerating from a standstill. The highway rating showcases the engine’s ability to cruise efficiently once up to speed. The S6’s powertrain management system and relatively aerodynamic shape contribute to this highway performance, even with the inherent inefficiencies of a high-performance V8.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2018 Audi S6 at $3,200. This figure is based on driving 15,000 miles per year and using the EPA’s estimate of average fuel prices. Keep in mind that this is just an estimate. Actual fuel costs will vary depending on driving habits, local fuel prices, and the grade of fuel used. The S6 requires premium gasoline, which typically adds to the cost per gallon. This annual cost should factor into any prospective buyer’s budget.

Real-world expectations

While the EPA provides standardized fuel economy figures, real-world MPG often differs. Aggressive driving, frequent short trips, and carrying extra weight can all negatively impact fuel consumption. Careful acceleration, consistent speeds, and proactive maintenance can help drivers achieve numbers closer to the EPA estimates. S6 owners who frequently exploit the engine’s generous power reserves should expect to see figures at the lower end of the range. Driving style is a crucial factor.

How it compares

The 2018 Audi S6 exists in a competitive segment where performance is important, but efficiency is still a consideration. The BMW M550i xDrive, another all-wheel-drive performance sedan, achieves a slightly better 20 MPG combined. The Mercedes-AMG E43 Sedan, while packing a smaller engine, manages around 21 MPG combined. Comparing S6 MPG across all years reveals trends and variations that might influence a buyer’s choice, especially on the used market. Considering all Audi fuel economy data, the S6 sits decidedly on the performance-oriented end of the brand’s spectrum.

Tips to maximize efficiency

The most direct route to less gas is simply easing off the accelerator. The S6’s potent V8 is responsive even with gentle inputs, and modulating throttle pressure can significantly improve fuel economy on a daily basis. Anticipate traffic flow, coast when possible, and avoid unnecessary hard accelerations to see a noticeable difference.

Ensure your S6 is properly maintained. Regular tire pressure checks, oil changes, and filter replacements not only extend the life of your vehicle, but also contribute to optimal fuel efficiency. An engine working harder due to neglect burns more fuel.

Take advantage of the S6’s drive select modes. While “Dynamic” mode unleashes the engine’s full potential, “Comfort” or “Efficiency” modes adjust throttle response and shift points for improved fuel economy. Using these modes during everyday commuting can produce worthwhile savings.

Minimize idling. Letting the engine run unnecessarily wastes fuel. If you’re stopped for more than a minute, it’s generally more fuel-efficient to turn off the engine. Modern engines are designed to restart quickly and reliably, so this “stop-start” approach can benefit economy around town. The S6’s standard auto stop/start system will help.