DecodedCarsAudi S7 vs Mercedes-Benz C-Class
2025 Audi S7 vs 2025 Mercedes-Benz C-Class — two rivals compared on efficiency, size, safety and reliability.
The short version
The Mercedes-Benz C-Class is more fuel-efficient: 29 vs 22 MPG combined in its best version.
That works out to about $900 a year less in fuel for the Mercedes-Benz C-Class (EPA estimate, 15,000 miles).
The Audi S7 is the bigger car, about 9 inches longer.
Across all model years since 2005, the Mercedes-Benz C-Class has had fewer recall campaigns (0 vs 14).
The two cars
The 2025 Audi S7 is a midsize car offered with a 2.9L 6-cyl engine, including a hybrid version and all-wheel drive. It measures about 196 inches long and 75 inches wide on a 115-inch wheelbase, with a curb weight of roughly 4,606 lb.
The 2025 Mercedes-Benz C-Class is a compact car offered with a 2.0L 4-cyl turbo engine, including a hybrid version and rear-wheel drive and all-wheel drive. It measures about 189 inches long and 72 inches wide on a 113-inch wheelbase, with a curb weight of roughly 4,057 lb (Amg C43 4matic 4dr Sedan).
Buying used? The 2024 S7 and the 2024 C-Class have the fewest problems in our data; avoid the 2021 S7.
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 S7 if…
- You want more room (9 in longer)
Choose the Mercedes-Benz C-Class if…
- You want lower fuel bills (29 vs 22 MPG)
- You want something easier to park (9 in shorter)
- You put reliability history first (0 vs 14 recalls since 2005)
Pros & cons of each
2025 Audi S7
- Hybrid version availableOffered as a hybrid as well as gas.
- Below-average fuel economyBest version gets 22 MPG combined, 27% below the 2025 midsize car average of 30 MPG.
- Premium fuel requiredEvery gasoline version is rated for premium, which raises running costs.
2025 Mercedes-Benz C-Class
- Hybrid version availableOffered as a hybrid and plug-in hybrid as well as gas.
- AWD / 4WD available
- No recalls so far
- Premium fuel requiredEvery gasoline version is rated for premium, which raises running costs.
Full 2025 Audi S7 specs →Full 2025 Mercedes-Benz C-Class specs →Compare fuel costs for your driving →Compare size & garage fit →