If fuel cost matters most
Mercedes-Benz C-Class with up to 40 MPG combined.
Side-by-side verified model comparison
Mercedes-Benz C-Class vs Audi A6
Mercedes-Benz C-Class and Audi A6 answer the same shopping question from different directions. The C-Class is more efficient on verified EPA data, while the C-Class reaches the higher power peak. Use the table below to decide whether your priority is fuel cost, safety, size or outright output.
At a glance
| Metric | Mercedes-Benz C-Class | Audi A6 |
|---|---|---|
| Production coverage | 1993 - present | 1994 - present |
| Verified generations | 2 | 2 |
| Peak power | 408 hp | 340 hp |
| Best EPA combined | 40 MPG | 33 MPG |
| Latest NHTSA overall | 5★ | 5★ |
| Open recalls (2021/2018) | 0 | 2 |
| Latest dimensions | 4751 × 1820 × 1438 mm | 4939 × 1886 × 1457 mm |
| Average curb weight | 1737 kg (3829 lbs) | 1837 kg (4050 lbs) |
| Fuel types | Petrol | Petrol, Diesel |
If power matters most
Mercedes-Benz C-Class with a verified peak of 408 hp.
If safety is the filter
They are effectively tied on this metric; use the table and generation links for context.
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Head-to-Head: Base Model Specifications
A detailed side-by-side comparison of the entry-level powertrain for the newest verified generation of each model. This shows exactly what you get before adding options or stepping up to premium trims.
| Specification | Mercedes-Benz C-ClassC-Class W206 C 200 mild-hybrid | Audi A6A6 C8 45 TFSI 2.0 |
|---|---|---|
| Engine & Performance | ||
| Engine Type | Petrol | Petrol |
| Cylinders / Configuration | I4 + ISG | I4 |
| Displacement | 1.5L (1496 cc) | 2.0L (1984 cc) |
| Aspiration | Turbocharged | Turbocharged |
| Horsepower | 204 hp | 245 hp |
| Torque | 300 Nm | 370 Nm |
| 0-100 km/h (0-62 mph) | 7.3 s | 6.8 s |
| Top Speed | 246 km/h | 250 km/h |
| Transmission & Drivetrain | ||
| Transmission | Automatic | Dual-clutch |
| Gears | 9 | 7 |
| Drivetrain | RWD | AWD |
| Fuel Economy & Range | ||
| City MPG (EPA) | 33.0 MPG | 26.0 MPG |
| Highway MPG (EPA) | 46.0 MPG | 34.0 MPG |
| Combined MPG (EPA) | 40.0 MPG | 30.0 MPG |
| Electric Range | — | — |
| Battery Capacity | — | — |
| CO₂ Emissions | 142 g/km | 162 g/km |
| Dimensions & Utility | ||
| Length | 4751 mm | 4939 mm |
| Width | 1820 mm | 1886 mm |
| Height | 1438 mm | 1457 mm |
| Wheelbase | 2865 mm | 2924 mm |
| Curb Weight | 1665 kg | 1745 kg |
| Doors / Seats | 4 / 5 | 4 / 5 |
What search winners do that generic comparisons don’t
The top-ranking comparison pages win because they answer an explicit buying job: which one is more efficient, which one is safer, which one is larger, which one has the broader powertrain range. Pages that only dump two brochures side by side rarely hold clicks.
This comparison uses the newest verified generation of each model as the headline lens, then routes you into the exact generation sheets for the trim-level details. That is more durable than comparing incentives or dealer inventory, and more trustworthy than hiding missing data behind a made-up score.
Questions buyers ask
Which is more fuel-efficient, the C-Class or the A6?
Mercedes-Benz C-Class wins on verified EPA combined economy at up to 40 MPG, versus 33 MPG for the Audi A6.
Which has more horsepower, the C-Class or the A6?
Mercedes-Benz C-Class reaches the higher verified peak at 408 hp, compared with 340 hp for the Audi A6.
Which is safer: C-Class or A6?
Mercedes-Benz C-Class has a latest recorded NHTSA overall rating of 5★; Audi A6 has 5★. Cross-check the frontal, side and rollover rows rather than using one headline number alone.
Is this a trim-by-trim comparison?
This page compares the newest verified generation of each model family. For year-specific engines, dimensions and trim tables, open the linked generation pages for each side.