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Audi S8: MPG and fuel economy by year

The EPA has rated the Audi S8 across 17 model years, from the 2003 Audi S8 through the 2026 Audi S8. The most recent 2026 Audi S8 returns 18 combined MPG. The most efficient model year was the 2015 Audi S8 at 20 MPG. The nameplate has been in continuous production long enough to span multiple generations of EPA testing methodology.

Pick a year below to open the full Audi S8 page for that model year. Each year page covers combined, city, and highway MPG, the trim variants the EPA rates separately, the annual fuel cost across three driving patterns, and a year-over-year comparison so you can see whether the car has improved.

Fuel economy by model year

Combined MPG, city MPG, highway MPG, and the EPA's estimated annual fuel cost for every model year of the Audi S8. Click any year to see the full breakdown for that model year, including trim variants, the drivetrain, and a comparison against other vehicles in its segment.

Year Model Combined MPG City Highway Annual fuel cost
2026 2026 Audi S8 18 MPG 15 MPG 24 MPG $3,850
2025 2025 Audi S8 18 MPG 15 MPG 24 MPG $3,850
2024 2024 Audi S8 18 MPG 15 MPG 24 MPG $3,850
2023 2023 Audi S8 18 MPG 15 MPG 23 MPG $3,850
2022 2022 Audi S8 17 MPG 14 MPG 23 MPG $4,050
2021 2021 Audi S8 16 MPG 13 MPG 22 MPG $4,300
2020 2020 Audi S8 16 MPG 13 MPG 22 MPG $4,300
2018 2018 Audi S8 18 MPG 14 MPG 24 MPG $3,850
2017 2017 Audi S8 18 MPG 15 MPG 24 MPG $3,850
2016 2016 Audi S8 18 MPG 15 MPG 25 MPG $3,850
2015 2015 Audi S8 20 MPG 16 MPG 27 MPG $3,450
2014 2014 Audi S8 18 MPG 15 MPG 26 MPG $3,850
2013 2013 Audi S8 18 MPG 15 MPG 26 MPG $3,850
2009 2009 Audi S8 15 MPG 13 MPG 19 MPG $4,600
2008 2008 Audi S8 15 MPG 13 MPG 19 MPG $4,600
2007 2007 Audi S8 15 MPG 13 MPG 19 MPG $4,600
2003 2003 Audi S8 16 MPG 14 MPG 20 MPG $4,300

How the Audi S8 compares against the Large Cars class

Buyers usually compare the Audi S8 against other cars in the same EPA class. The list below shows the most efficient cars in the Large Cars class for the 2026 model year, the latest year on this page. Each link opens the full page for that car.

2026 Lucid Air Pure RWD with 19 inch wheels
146 MPG 2026 Lucid Air Touring AWD with 19 inch wheels
134 MPG 2026 Lucid Air Pure RWD with 20 inch wheels
129 MPG 2026 Lucid Air G Touring XR AWD with19 inch wheels
128 MPG 2026 Tesla Model S
124 MPG 2026 Lucid Air Touring AWD with 20 inch wheels
123 MPG
2026 Audi S8
18 MPG

Source: U.S. EPA fuel economy dataset. Annual fuel cost assumes 15,000 miles of driving per year and a 55% city, 45% highway split.