The Audi A6 Avant (C8) 55 TFSI e, produced from February 2021 to May 2023, represents Audi’s foray into plug-in hybrid technology within the executive wagon segment. Positioned as a premium offering within the C8 A6 Avant range, it combines a 2.0-liter turbocharged four-cylinder gasoline engine with an electric motor and a lithium-ion battery pack, delivering a combined system output of 367 horsepower. This variant aimed to provide a balance of performance, efficiency, and practicality for buyers seeking a sophisticated and environmentally conscious vehicle. It utilizes Audi’s quattro all-wheel drive system and a seven-speed S tronic dual-clutch transmission.
Technical Specifications
| Brand | Audi |
| Model | A6 |
| Generation | A6 Avant (C8) |
| Type | 55 TFSI e (367 Hp) Plug-in Hybrid quattro ultra S tronic |
| Start of production | February, 2021 |
| End of production | May, 2023 |
| Powertrain Architecture | PHEV (Plug-in Hybrid Electric Vehicle) |
| Body type | Station wagon (estate) |
| Seats | 5 |
| Doors | 5 |
| Combined fuel consumption (WLTP) | 1.2-1.5 l/100 km (196 – 156.8 US mpg, 235.4 – 188.3 UK mpg, 83.3 – 66.7 km/l) |
| CO2 emissions (WLTP) | 30-36 g/km |
| Fuel consumption (NEDC) – combined | 1.5-1.6 l/100 km (156.8 – 147 US mpg, 188.3 – 176.6 UK mpg, 66.7 – 62.5 km/l) |
| CO2 emissions (NEDC) | 34-37 g/km |
| Fuel Type | Petrol / electricity |
| Acceleration 0 – 100 km/h | 5.7 sec |
| Acceleration 0 – 62 mph | 5.7 sec |
| Acceleration 0 – 60 mph | 5.4 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro-6d-ISC-FCM |
| Weight-to-power ratio | 5.7 kg/Hp, 176.9 Hp/tonne |
| Weight-to-torque ratio | 4.2 kg/Nm, 241 Nm/tonne |
| Gross battery capacity | 17.9 kWh |
| Net (usable) battery capacity | 14.4 kWh |
| Battery technology | Lithium-ion (Li-Ion) |
| Battery location | Under the trunk |
| All-electric range (WLTP) | 60-66 km (37.28 – 41.01 mi) |
| Average Energy consumption (NEDC) | 17.5-18.1 kWh/100 km (28.16 – 29.13 kWh/100 mi, 120 – 116 MPGe, 5.7 – 5.5 km/kWh, 3.6 – 3.4 mi/kWh) |
| Max speed (electric) | 135 km/h (83.89 mph) |
| Electric motor power | 143 Hp |
| Electric motor Torque | 350 Nm (258.15 lb.-ft.) |
| Electric motor location | Between the combustion engine and the transmission |
| System power | 367 Hp |
| System torque | 500 Nm (368.78 lb.-ft.) |
| Power | 265 Hp @ 5250-6500 rpm |
| Torque | 370 Nm @ 1600-4500 rpm (272.9 lb.-ft. @ 1600-4500 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | DLGA |
| Engine displacement | 1984 cm3 (121.07 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 82.5 mm (3.25 in.) |
| Piston Stroke | 92.8 mm (3.65 in.) |
| Compression ratio | 9.6:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 5.2 l (5.49 US qt | 4.58 UK qt) |
| Coolant | 16.9 l (17.86 US qt | 14.87 UK qt) |
| Kerb Weight | 2075 kg (4574.59 lbs.) |
| Max. weight | 2675 kg (5897.37 lbs.) |
| Max load | 600 kg (1322.77 lbs.) |
| Trunk (boot) space – minimum | 405 l (14.3 cu. ft.) |
| Trunk (boot) space – maximum | 1535 l (54.21 cu. ft.) |
| Fuel tank capacity | 52 l (13.74 US gal | 11.44 UK gal) |
| Max. roof load | 100 kg (220.46 lbs.) |
| Permitted trailer load with brakes (12%) | 2000 kg (4409.25 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 95 kg (209.44 lbs.) |
| Length | 4939 mm (194.45 in.) |
| Width | 1886 mm (74.25 in.) |
| Width including mirrors | 2110 mm (83.07 in.) |
| Height | 1467 mm (57.76 in.) |
| Wheelbase | 2924 mm (115.12 in.) |
| Front track | 1630 mm (64.17 in.) |
| Rear (Back) track | 1617 mm (63.66 in.) |
| Front overhang | 920 mm (36.22 in.) |
| Rear overhang | 1095 mm (43.11 in.) |
| Drag coefficient (Cd) | 0.29 |
| Minimum turning circle (turning diameter) | 12.1 m (39.7 ft.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) and the electric motor permanently drive the front wheels of the vehicle, capable of running in full electric or mixed mode, and if necessary through the electrically or mechanically controlled clutch, the rear wheels are driven. |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 7 gears, automatic transmission S tronic |
| Front suspension | Independent multi-link suspension, Transverse stabilizer |
| Rear suspension | Independent multi-link suspension, Transverse stabilizer |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
INTRODUCTION
The Audi A6 Avant (C8) 55 TFSI e, launched in 2021, is a plug-in hybrid variant of the C8 generation A6 Avant (estate). Built on the MLB Evo platform (1HX0/A3), it represents Audi’s commitment to electrification and reducing emissions. This model aimed to appeal to buyers who desired the practicality of a wagon with the benefits of electric driving for shorter commutes and reduced fuel consumption. The “55 TFSI e” designation signifies its powertrain configuration – a 2.0-liter turbocharged engine combined with an electric motor, delivering a combined output placing it within Audi’s performance tiering.
Powertrain & Engine Architecture
At the heart of the 55 TFSI e lies a 1,984 cc (121.07 cu. in.) inline-four cylinder gasoline engine, designated the DLGA engine code. This engine utilizes direct fuel injection and is coupled with a single turbocharger and intercooler to produce 265 horsepower at 5,250-6,500 rpm and 370 Nm (272.9 lb.-ft.) of torque between 1,600 and 4,500 rpm. The engine features a DOHC valvetrain with four valves per cylinder. Integrated with this engine is a 143 hp electric motor, positioned between the engine and the transmission. The electric motor draws power from a 17.9 kWh (gross) / 14.4 kWh (net) lithium-ion battery pack located under the trunk floor. Power is delivered to all four wheels via Audi’s quattro all-wheel drive system and a seven-speed S tronic dual-clutch transmission. The S tronic transmission provides quick and smooth gear changes, enhancing both performance and efficiency. The hybrid system allows for electric-only driving for up to 60-66 km (37.28 – 41.01 mi) depending on driving conditions.
Driving Characteristics
The A6 Avant 55 TFSI e offers a refined and responsive driving experience. In electric mode, the vehicle provides near-silent acceleration and instant torque, making it ideal for urban driving. When the gasoline engine engages, the combined output of 367 hp and 500 Nm (368.78 lb.-ft.) of torque results in brisk acceleration, achieving 0-100 km/h (0-62 mph) in 5.7 seconds. Compared to the standard A6 Avant models with lower-powered engines, the 55 TFSI e delivers significantly enhanced performance. While the added weight of the battery pack slightly impacts handling compared to lighter A6 variants, the quattro all-wheel drive system provides excellent traction and stability. The S tronic transmission’s gear ratios are optimized for both efficiency and performance, offering seamless transitions between electric and gasoline power.
Equipment & Trim Levels
The 55 TFSI e trim typically came well-equipped as a premium offering. Standard features included Audi’s Virtual Cockpit digital instrument cluster, a large touchscreen infotainment system with navigation, leather upholstery, three-zone automatic climate control, and a suite of advanced driver-assistance systems such as adaptive cruise control, lane departure warning, and automatic emergency braking. Optional extras included a Bang & Olufsen sound system, panoramic sunroof, and matrix LED headlights. Interior trim options varied, allowing buyers to personalize the cabin with different wood or aluminum inlays. The exterior styling was largely consistent with other A6 Avant models, with subtle “TFSI e” badging to denote its hybrid powertrain.
Chassis & Braking
The A6 Avant 55 TFSI e utilizes an independent multi-link suspension system for both the front and rear axles, providing a comfortable and controlled ride. Transverse stabilizers are fitted to both axles to minimize body roll during cornering. The braking system consists of ventilated discs on all four wheels, providing ample stopping power. ABS (Anti-lock braking system) is standard, along with electronic brake-force distribution and brake assist. Due to the increased weight from the battery pack, the suspension was tuned to provide adequate support and maintain handling balance. The steering system is an electric power steering rack and pinion, offering precise and responsive steering feel.
Market Reception & Comparison
The A6 Avant 55 TFSI e was generally well-received by automotive critics. It was praised for its blend of performance, efficiency, and practicality. Compared to other A6 Avant trims, the 55 TFSI e offered significantly better fuel economy and lower emissions, particularly for drivers who frequently utilize the electric driving mode. However, the higher purchase price and the reduced trunk space due to the battery pack were noted as potential drawbacks. Compared to competitors like the BMW 5 Series xDrive45e and Mercedes-Benz E 350 e, the A6 Avant 55 TFSI e offered a competitive combination of features, performance, and refinement.
Legacy
The Audi A6 Avant 55 TFSI e represents an important step in Audi’s transition towards electrification. While relatively early in the plug-in hybrid landscape, the powertrain has proven to be reasonably reliable, with the primary concerns revolving around battery degradation over time. On the used car market, these models hold their value relatively well, appealing to buyers seeking a premium wagon with low running costs and environmental benefits. The integration of the electric motor and gasoline engine demonstrated Audi’s engineering capabilities and paved the way for future generations of hybrid and electric vehicles.
