The 2020 Audi S8 delivers 16 MPG combined. This isn’t an economy car; it’s a meticulously engineered, high-performance luxury sedan capable of exceeding speed limits. Fuel efficiency isn’t the primary concern for its target buyer. People choose the S8 for its elegance, strong acceleration, and comfort, features that require a powerful engine and drivetrain.

City and highway performance

The S8’s EPA ratings show 13 MPG in the city and 22 MPG on the highway. The city figure reflects the demands on the 4.0-liter twin-turbo V8 in stop-and-go traffic, where its power is largely untapped and the start-stop system operates frequently. The highway number suggests the engine’s efficiency when cruising at a constant speed. The S8’s long gearing and cylinder deactivation technology contribute to this better highway fuel consumption. However, aggressive driving will diminish these gains.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2020 Audi S8 is $3,600. This is based on driving 15,000 miles per year and using the national average fuel price for premium gasoline. Actual costs could exceed this, depending on driving habits and local fuel prices. Frequent rapid acceleration will result in a higher fuel bill.

Real-world expectations

The EPA ratings are estimates. Several factors influence actual fuel economy. Driving style, traffic, weather, and tire pressure all affect gas mileage. Owners who prioritize performance and use the S8’s sport modes should expect fuel consumption closer to the city rating, even on long trips. Careful drivers who use the S8 for highway cruising might achieve slightly better than the EPA highway estimate. Matching the EPA numbers requires effort and disciplined driving.

How it compares

The Audi S8’s fuel economy is predictably low compared to its competitors. The Mercedes-AMG S63 sedan, with its similar twin-turbo V8, achieves a comparable 17 MPG combined. The BMW M760i xDrive, boasting a V12 engine, manages only 15 MPG combined. Even a less powerful option like the Porsche Panamera 4S only achieves around 21 MPG combined. For buyers in this segment, the slightly lower fuel cost of some competitors is an insignificant factor compared to the performance and luxury they expect. You can view all Audi fuel economy data on our site as well. If you are interested about yearly trends, you can view S8 MPG across all years.

Tips to maximize efficiency

Avoid rapid acceleration. Gentle starts and smooth acceleration will improve fuel consumption, especially in city driving. The S8 has different driving modes. Selecting “Comfort” or “Efficiency” mode will optimize the engine and transmission settings for better fuel economy. The S8’s cylinder deactivation system shuts down four cylinders under light load to save fuel. Maintain proper tire inflation. Underinflated tires increase rolling resistance, which reduces fuel efficiency. Check the sticker on the driver’s side doorjamb for the recommended tire pressure.