Audi A6 C8
Produced from 2018–present, the Audi A6 C8 (4K) is catalogued here with 3 powertrains. 2 petrol, 1 diesel, spanning 245 to 340 hp. The quickest version, the 55 TFSI quattro 3.0, covers 0–100 km/h in 5.1 seconds. For fuel costs, the 50 TDI quattro leads the range at 33 MPG (EPA combined). Externally it measures 4939 × 1886 × 1457 mm on a 2924 mm wheelbase. Full engine, transmission, performance, economy and weight data is compared trim-by-trim below, with EPA and NHTSA sources cited at the bottom of the page.
Generation Quick Facts: The Audi A6 C8 (4K) was manufactured from 2018 – present (2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026 model years) as a sedan. Across 3 verified powertrains, power outputs range from 245 to 340 hp, with top fuel economy reaching 33.0 MPG combined (50 TDI quattro).
Power range
245–340 hp
Quickest 0–100
5.1 s
Best combined
33 MPG
Length
4.94 m
01Decision support
Which A6 C8 suits you?
Daily driver · least fuel
50 TDI quattro
33.0 MPG combined
It burns up to 15% less fuel per mile than the thirstiest A6 C8.
Performance · quickest
55 TFSI quattro 3.0
0–100 km/h in 5.1s · 340 hp
The straight-line choice of this generation.
Sweet spot · balance
50 TDI quattro
286 hp · 33.0 MPG
Sits mid-range for power without paying the fuel or price tax of the flagship trim. Usually the best value on the used market.
023 powertrains (2 petrol · 1 diesel)
Full specifications
| Specification | 45 TFSI 2.0Petrol | 50 TDI quattroDiesel | 55 TFSI quattro 3.0Petrol |
|---|---|---|---|
| Engine | |||
| Engine code | EA888 gen3 | EA897 evo3 | EA839 |
| Fuel type | Petrol | Diesel | Petrol |
| Displacement | 2.0L (1,984 cc) | 3.0L (2,967 cc) | 3.0L (2,995 cc) |
| Aspiration | Turbocharged | Turbocharged | Turbocharged |
| Cylinders | I4 | V6 | V6 |
| Power & Performance | |||
| Power | 245 hp / 183 kW | 286 hp / 213 kW | 340 hp / 254 kW |
| Torque | 370 Nm / 273 lb-ft | 620 Nm / 457 lb-ft | 500 Nm / 369 lb-ft |
| 0–100 km/h | 6.8 s | 5.5 s | 5.1 s |
| Top speed | 250 km/h (155 mph) | 250 km/h (155 mph) | 250 km/h (155 mph) |
| Transmission & Drivetrain | |||
| Transmission | Dual-clutch | Automatic | Dual-clutch |
| Gears | 7 | 8 | 7 |
| Drivetrain | AWD | AWD | AWD |
| Fuel Economy & Emissions | |||
| City | 26 MPG (9.0 L/100km) | 29 MPG (8.1 L/100km) | 24 MPG (9.8 L/100km) |
| Highway | 34 MPG (6.9 L/100km) | 38 MPG (6.2 L/100km) | 32 MPG (7.4 L/100km) |
| Combined | 30 MPG (7.8 L/100km) | 33 MPG (7.1 L/100km) | 28 MPG (8.4 L/100km) |
| Electric range | — | — | — |
| Battery | — | — | — |
| CO₂ emissions | 162 g/km | 179 g/km | 174 g/km |
| Weight & Body | |||
| Curb weight | 1,745 kg (3,847 lbs) | 1,915 kg (4,222 lbs) | 1,850 kg (4,079 lbs) |
| Seats | 5 | 5 | 5 |
| Doors | 4 | 4 | 4 |
| Model years | 2018–present | 2018–present | 2018–present |
03Then vs now
4K vs. previous generation
| Metric | Change vs. 4G |
|---|---|
| Peak power | +40 hp |
| Quickest 0–100 km/h | -0.5 s |
| Best combined MPG | unchanged |
| Average curb weight | +167 kg |
Why this matters
Versus the 4G, the 4K is noticeably more powerful, quicker off the line, heavier, mostly safety and equipment mass. Used-car shoppers should weigh these shifts against the 4G's typically lower asking prices.
View the 4G spec sheet0Exterior
Dimensions
Length
4,939 mm
194.4 in
Width
1,886 mm
74.3 in
Height
1,457 mm
57.4 in
Wheelbase
2,924 mm
115.1 in
Curb weight spans 1,745–1,915 kg depending on powertrain. Battery and AWD hardware add the most mass.
05Long-tail answers
A6 C8: questions answered
What engines and trims are available on the Audi A6 C8 (4K)?
The Audi A6 C8 (4K) lineup offers 2 petrol · 1 diesel: 45 TFSI 2.0 (245 hp), 50 TDI quattro (286 hp), 55 TFSI quattro 3.0 (340 hp).
How quick is the Audi A6 C8 (4K) from 0 to 100 km/h?
The fastest trim, the 55 TFSI quattro 3.0, accelerates from 0 to 100 km/h in 5.1s, reaching a top speed of 250 km/h (155 mph) with the 45 TFSI 2.0.
What is the most fuel-efficient Audi A6 C8 (4K) trim?
The 50 TDI quattro delivers the highest fuel economy at 33.0 MPG (EPA combined). Across the 3 powertrains, fuel economy spans 28–33 combined MPG.
How does the 4K compare to the previous Audi A6?
Against the 4G predecessor it replaces, the 4K is noticeably more powerful, quicker off the line, heavier, mostly safety and equipment mass. Side-by-side technical specs are detailed in the comparison table below.
What model years are included in the Audi A6 C8 (4K)?
The Audi A6 C8 (4K) was produced from 2018 – present, spanning the following model years: 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026.
What are the exterior dimensions of the Audi A6 C8 (4K)?
4939 mm long, 1886 mm wide, 1457 mm tall on a 2924 mm wheelbase (194.4 in overall length).
Sources for this page
- EPA fuel-economy records: Audi A6Certification data, 2018–2026
- NHTSA vehicle file: recalls, complaints and investigations2018 Audi A6, official safety record
- NHTSA vPIC vehicle databasePowers our VIN decoder, the federal manufacturer registry
- Audi official: data sheets and archiveManufacturer-published specifications
Figures on this page are compiled from the sources above and cross-checked against manufacturer data sheets. US-market EPA cycle where noted; European WLTP values are measured differently and are not directly comparable.
Guides worth reading before you choose
AWD vs. 4WD vs. FWD vs. RWD: The Complete Drivetrain Guide (Mechanics, Snow, Towing & Efficiency)
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CVT vs. DCT vs. DSG vs. Automatic: Every Car Transmission Compared
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Turbocharged vs. Naturally Aspirated Engines: Boost, Lag, Reliability & Fuel Economy
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