The 2024 Audi S8 4.0L 8-cyl achieves 18 MPG combined. This figure won’t win any fuel-sipping contests, but it hardly matters to the executive who prioritizes a handcrafted leather interior, a thunderous twin-turbo V8, and the quiet confidence to devour autobahn miles at triple-digit speeds. This isn’t a car for the budget-conscious commuter; it’s a statement, a rolling office of power and privilege where fuel efficiency plays a secondary role to effortless performance.

City and highway performance

The S8’s official EPA ratings break down to 15 MPG in the city and 24 MPG on the highway. The city figure reflects the S8’s considerable weight and the stop-and-go conditions that are harmful to fuel conservation. The engine’s start-stop system attempts to mitigate some of this, but the S8 is happiest, and relatively most efficient, when allowed to stretch its legs on the open road. The 24 MPG highway rating, while not stellar, is respectable given the S8’s prodigious horsepower and standard quattro all-wheel drive. Expect to see that number dip quickly if you’re consistently exploiting the engine’s full potential. The transmission, an eight-speed automatic specifically tuned for the S8, makes the most of the engine’s broad powerband and helps keep the revs relatively low at cruising speeds.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2024 Audi S8 at $3,200. This figure is based on driving 15,000 miles per year, with 45% of those miles driven in the city and 55% on the highway. It also assumes national average fuel prices. Of course, premium fuel is required, and fluctuations in gasoline prices can significantly impact this estimate, especially if fuel costs remain stubbornly high.

Real-world expectations

While the EPA provides a standardized benchmark, real-world MPG for the S8 is heavily dependent on driving style and conditions. Someone frequently using launch control and spending most of their time in congested urban environments will likely see their fuel economy fall well below the official figures. On the other hand, a driver who adopts a more relaxed pace and prioritizes highway cruising could potentially match or even slightly exceed the 24 MPG highway rating. The S8’s fuel tank capacity is sufficient for reasonable long-distance travel, but frequent fill-ups should be expected if the car is used as intended.

How it compares

Compared to its direct competitors, the S8’s fuel economy lands roughly in the middle of the pack. The BMW M760i xDrive, with its larger V12 engine, manages around 15 MPG combined. The Mercedes-AMG S63 Sedan, with its similar twin-turbo V8, is rated in the same ballpark. The Porsche Panamera Turbo, while offering a plug-in hybrid variant with superior fuel economy, delivers similar figures to the S8 in its non-hybrid V8 guise. For those seeking alternatives within the Audi family, you may find all Audi fuel economy data on this site. Buyers of the S8, however, rarely cross-shop it against more frugal options; they are willing to accept the fuel consumption in exchange for the performance and prestige that the S8 represents. You can also see S8 MPG across all years on this site.

Tips to maximize efficiency

Avoid aggressive acceleration. The S8’s powerful engine can tempt you to unleash its full potential at every opportunity, but resist the urge if you want to conserve fuel. Gentle acceleration and anticipating traffic flow will significantly improve your MPG.

Use cruise control on the highway. Maintaining a consistent speed is crucial for maximizing fuel efficiency, especially on long journeys. The S8’s adaptive cruise control system can help maintain a safe following distance while optimizing fuel consumption.

Check your tire pressure regularly. Underinflated tires increase rolling resistance, which negatively impacts fuel economy. Ensure your tires are inflated to the recommended pressure listed on the door jamb sticker.

Minimize idling. Letting the engine idle for extended periods wastes fuel unnecessarily. If you’re stopped for more than a minute, turn off the engine. The S8’s start-stop system will automatically shut off the engine at traffic lights and restarts it when you’re ready to go.

Keep up with scheduled maintenance. A well-maintained engine operates more efficiently. Follow Audi’s recommended maintenance schedule for oil changes, filter replacements, and other services to ensure optimal fuel economy.