The Audi A4 Avant (B9 8W) g-tron 2.0 TFSI, produced from 2017 to 2018, represents a unique offering within the broader B9 A4 Avant lineup. This variant distinguished itself by its bi-fuel capability, designed to run on either gasoline or Compressed Natural Gas (CNG). Positioned as a more environmentally conscious alternative, the g-tron aimed to appeal to European markets increasingly focused on alternative fuel vehicles. It utilized the well-established A4 Avant platform (based on the MLB Evo architecture) but incorporated specific engine and fuel system modifications to accommodate CNG operation. This model was primarily sold in Europe, where CNG infrastructure was more developed, and wasn’t widely available in North America.
Technical Specifications
| Brand | Audi |
| Model | A4 |
| Generation | A4 Avant (B9 8W) |
| Type (Engine) | g-tron 2.0 TFSI (170 Hp) |
| Start of production | 2017 |
| End of production | 2018 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Station wagon (estate) |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (economy) – urban | 8-8.3 l/100 km (29.4 – 28.3 US mpg, 35.3 – 34 UK mpg, 12.5 – 12 km/l) |
| Fuel consumption (economy) – urban (CNG) | 5.5-5.7 kg/100 km |
| Fuel consumption (economy) – extra urban | 4.9-5.4 l/100 km (48 – 43.6 US mpg, 57.6 – 52.3 UK mpg, 20.4 – 18.5 km/l) |
| Fuel consumption (economy) – extra urban (CNG) | 3.3-3.6 kg/100 km |
| Fuel consumption (economy) – combined | 6-6.5 l/100 km (39.2 – 36.2 US mpg, 47.1 – 43.5 UK mpg, 16.7 – 15.4 km/l) |
| Fuel consumption (economy) – combined (CNG) | 4-4.4 kg/100 km |
| CO2 emissions | 136-147 g/km |
| CO2 emissions (CNG) | 109-117 g/km |
| Fuel Type | Petrol / CNG |
| Acceleration 0 – 100 km/h | 8.5 sec |
| Acceleration 0 – 62 mph | 8.5 sec |
| Acceleration 0 – 60 mph | 8.1 sec |
| Maximum speed | 223 km/h (138.57 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 9.2 kg/Hp, 109 Hp/tonne |
| Weight-to-torque ratio | 5.8 kg/Nm, 173.1 Nm/tonne |
| Power | 170 Hp @ 4450-6000 rpm |
| Power per litre | 85.7 Hp/l |
| Torque | 270 Nm @ 1650-4400 rpm (199.14 lb.-ft. @ 1650-4400 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | EA888 / CVLA |
| 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.) |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection and Multi-port manifold injection |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 5.2 l (5.49 US qt | 4.58 UK qt) |
| Kerb Weight | 1560 kg (3439.21 lbs.) |
| Max. weight | 2100 kg (4629.71 lbs.) |
| Max load | 540 kg (1190.5 lbs.) |
| Trunk (boot) space – minimum | 415 l (14.66 cu. ft.) |
| Trunk (boot) space – maximum | 1415 l (49.97 cu. ft.) |
| Fuel tank capacity | 25 l (6.6 US gal | 5.5 UK gal) |
| CNG cylinder capacity | 19 kg |
| Max. roof load | 90 kg (198.42 lbs.) |
| Permitted trailer load with brakes (8%) | 1700 kg (3747.86 lbs.) |
| Permitted trailer load with brakes (12%) | 1500 kg (3306.93 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 80 kg (176.37 lbs.) |
| Length | 4725 mm (186.02 in.) |
| Width | 1842 mm (72.52 in.) |
| Width including mirrors | 2022 mm (79.61 in.) |
| Height | 1442 mm (56.77 in.) |
| Wheelbase | 2818 mm (110.94 in.) |
| Front track | 1572 mm (61.89 in.) |
| Rear (Back) track | 1553 mm (61.14 in.) |
| Front overhang | 880 mm (34.65 in.) |
| Rear overhang | 1027 mm (40.43 in.) |
| Minimum turning circle (turning diameter) | 11.6 m (38.06 ft.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the front wheels of the vehicle. |
| Drive wheel | Front wheel drive |
| Number of gears and type of gearbox | 6 gears, manual transmission |
| Front suspension | Independent multi-link suspension, Transverse stabilizer |
| Rear suspension | Independent multi-link spring suspension with stabilizer |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 205/60 R16; 225/50 R17 |
| Wheel rims size | 7J x 16; 7.5J x 17 |
INTRODUCTION
The Audi A4 Avant (B9 8W) g-tron 2.0 TFSI, launched in 2017 and discontinued in 2018, was a station wagon variant of the popular A4 model, specifically engineered to run on both gasoline and Compressed Natural Gas (CNG). This model was a key part of Audi’s strategy to offer alternative fuel vehicles in the European market, where CNG infrastructure was relatively well-established. Built on the MLB Evo platform (shared with other Volkswagen Group vehicles), the g-tron aimed to provide a more sustainable driving experience without sacrificing the practicality and refinement expected of an Audi A4 Avant. It occupied a niche position within the A4 range, appealing to environmentally conscious buyers willing to adapt to the limitations of CNG refueling.
Powertrain & Engine Architecture
At the heart of the A4 Avant g-tron lay the EA888 2.0-liter turbocharged four-cylinder engine, designated CVLA. This engine was a modified version of the standard 2.0 TFSI, adapted to accommodate CNG operation. The key difference was the addition of a high-pressure CNG tank (19 kg capacity) and a revised fuel injection system. The engine could seamlessly switch between gasoline and CNG, or operate on a mixture of both. When running on CNG, the engine utilized direct injection, while gasoline operation employed both direct and multi-port fuel injection. The engine produced 170 horsepower at 4450-6000 rpm and 270 Nm (199.14 lb-ft) of torque between 1650-4400 rpm. The 6-speed manual transmission was standard, providing a balance between fuel efficiency and driver engagement. The engine featured a DOHC valvetrain and an intercooled turbocharger to enhance performance.
Driving Characteristics
The driving experience in the A4 Avant g-tron was largely similar to that of its gasoline-powered counterparts, albeit with a slight reduction in overall power output when running solely on CNG. The 6-speed manual transmission offered precise shifts, and the engine delivered a respectable level of performance for everyday driving. Acceleration from 0-100 km/h (0-62 mph) took approximately 8.5 seconds. The primary difference was noticeable during acceleration when running on CNG, where the engine felt slightly less responsive compared to gasoline. However, the seamless switching between fuels minimized any significant disruption to the driving experience. The gear ratios were optimized for fuel efficiency, prioritizing smooth cruising over outright performance.
Equipment & Trim Levels
The A4 Avant g-tron typically came with a well-equipped standard specification, reflecting Audi’s commitment to quality and refinement. Standard features included Audi’s MMI infotainment system with a central display screen, automatic climate control, power windows, and a comprehensive suite of safety features, including ABS, electronic stability control, and multiple airbags. Interior upholstery was typically cloth or a combination of cloth and leatherette. Optional extras included leather seats, a sunroof, a premium sound system, and advanced driver-assistance systems such as adaptive cruise control and lane departure warning. Trim levels were generally aligned with the standard A4 Avant range, offering various levels of customization and luxury.
Chassis & Braking
The A4 Avant g-tron shared its chassis and braking system with other A4 Avant models. It featured independent multi-link suspension at both the front and rear, providing a comfortable and controlled ride. A transverse stabilizer bar was fitted to both axles to reduce body roll during cornering. The braking system consisted of ventilated discs at the front and solid discs at the rear, providing ample stopping power. ABS (Anti-lock Braking System) was standard, enhancing safety and stability under hard braking. The suspension was tuned to balance comfort and handling, making it suitable for both city driving and long-distance journeys.
Market Reception & Comparison
The Audi A4 Avant g-tron received generally positive reviews from automotive critics, who praised its fuel efficiency and environmentally friendly credentials. However, its limited availability and the dependence on CNG infrastructure were seen as drawbacks. Compared to the standard A4 Avant 1.8 TFSI or 2.0 TFSI models, the g-tron offered lower running costs when utilizing CNG, but it also came with a slightly higher purchase price. The 1.8 TFSI offered similar performance on gasoline, while the 2.0 TFSI provided more power. The g-tron appealed to a specific niche of buyers who prioritized sustainability and were willing to accept the inconvenience of CNG refueling. Fuel economy was significantly improved when running on CNG, with combined figures reaching 4-4.4 kg/100 km.
Legacy
The Audi A4 Avant g-tron represents an interesting chapter in Audi’s exploration of alternative fuel technologies. While production was relatively short-lived, it demonstrated the feasibility of running a mainstream vehicle on CNG. In the used car market, the g-tron holds appeal for those seeking a more environmentally friendly option and have access to CNG refueling stations. The EA888 engine, in its various iterations, is known for its reliability, although the CNG-specific components may require specialized maintenance. The g-tron’s legacy lies in its contribution to the development of alternative fuel vehicles and its demonstration of Audi’s commitment to sustainable mobility.
