DecodedCarsAudi A6 vs Audi S8
2026 Audi A6 vs 2026 Audi S8 — two rivals compared on efficiency, size, safety and reliability.
The short version
The Audi A6 is more fuel-efficient: 24 vs 18 MPG combined in its best version.
That works out to about $1,150 a year less in fuel for the Audi A6 (EPA estimate, 15,000 miles).
The Audi S8 is the bigger car, about 9 inches longer.
Across all model years since 2005, the Audi S8 has had fewer recall campaigns (16 vs 33).
The two cars
The 2026 Audi A6 is a midsize station wagon offered with a 3.0L 6-cyl turbo engine, including a hybrid version and all-wheel drive. It measures about 197 inches long and 74 inches wide on a 115-inch wheelbase, with a curb weight of roughly 4,319 lb (4dr Sedan).
The 2026 Audi S8 is a large car offered with a 4.0L 8-cyl turbo engine, including a hybrid version and all-wheel drive. It measures about 204 inches long and 77 inches wide on a 118-inch wheelbase, with a curb weight of roughly 5,313 lb.
Buying used? The 2024 A6 and the 2024 S8 have the fewest problems in our data; avoid the 2019 A6 and the 2021 S8.
Basics
Efficiency
Performance & space
Safety & reliability
Interest
Green = clearly better. Prices are not included. How we calculate this →
Which one should you choose?
Choose the Audi A6 if…
- You want lower fuel bills (24 vs 18 MPG)
- You want something easier to park (9 in shorter)
Choose the Audi S8 if…
- You want more room (9 in longer)
- You put reliability history first (16 vs 33 recalls since 2005)
Pros & cons of each
2026 Audi A6
- Hybrid version availableOffered as a hybrid as well as gas.
- Lots of standard safety tech4 of 5 key driver aids standard on the versions we checked.
- Premium fuel requiredEvery gasoline version is rated for premium, which raises running costs.
2026 Audi S8
- Hybrid version availableOffered as a hybrid as well as gas.
- Below-average fuel economyBest version gets 18 MPG combined, 31% below the 2026 large car average of 25.9 MPG.
- Premium fuel requiredEvery gasoline version is rated for premium, which raises running costs.
Full 2026 Audi A6 specs →Full 2026 Audi S8 specs →Compare fuel costs for your driving →Compare size & garage fit →