2019 Audi A4 Avant (B9 8W facelift ) g-tron 40 TFSI (170 Hp) S tronic

The Audi A4 Avant (B9 8W) g-tron 40 TFSI S tronic, produced briefly in 2019, represents a unique offering within the broader B9 A4 Avant range. This variant was specifically designed for European markets embracing alternative fuel vehicles, combining a turbocharged gasoline engine with the capability to run on Compressed Natural Gas (CNG). Positioned as a fuel-efficient and environmentally conscious option, it sat between the standard petrol and diesel A4 Avants in terms of price and performance. The “facelift” designation (2018) refers to the cosmetic and technological updates applied to the B9 generation during that model year, influencing the g-tron’s final design and features.

Technical Specifications

Powertrain & Engine Architecture

The heart of the A4 Avant g-tron 40 TFSI is the CVLA engine, a 1.984-liter (121.07 cubic inches) inline-four cylinder gasoline engine. This engine utilizes direct fuel injection and is coupled with a turbocharger and intercooler to boost power and efficiency. The “40 TFSI” designation indicates a power output of approximately 170 horsepower. What sets this engine apart is its bi-fuel capability. It can run on gasoline, but is optimized for Compressed Natural Gas (CNG). When running on CNG, the engine management system adjusts to take advantage of the fuel’s higher octane rating and cleaner burning properties. The engine’s compression ratio is relatively high at 12.6:1, contributing to its thermal efficiency. The seven-speed S tronic dual-clutch transmission is standard, providing quick and smooth gear changes. This transmission is known for its efficiency and responsiveness, complementing the engine’s characteristics.

Driving Characteristics

The 170 hp output and S tronic transmission deliver a respectable, though not particularly sporty, driving experience. Acceleration from 0 to 62 mph (0-100 km/h) takes around 8.4 seconds. The S tronic transmission’s quick shifts help maximize the available power. Compared to the more powerful A4 variants (like the 2.0 TFSI with 248 hp), the g-tron feels less eager to accelerate. However, it offers a broader torque band, with 270 Nm (199.14 lb-ft) available from 1650 to 4400 rpm, making it feel responsive in everyday driving situations. The gear ratios are tuned for fuel efficiency and smooth cruising, rather than outright performance. Switching between gasoline and CNG is generally seamless, with minimal noticeable difference in power delivery.

Equipment & Trim Levels

The A4 Avant g-tron 40 TFSI typically came with a generous level of standard equipment, reflecting its position as a relatively premium offering. Standard features included Audi’s MMI infotainment system with a 7-inch display, three-zone automatic climate control, and a leather-wrapped multifunction steering wheel. Safety features such as lane departure warning and automatic emergency braking were also common. Interior upholstery was typically cloth, with leather options available as an upgrade. Optional extras included a larger MMI display, a Bang & Olufsen sound system, and various driver assistance packages. Trim levels were often aligned with the standard A4 Avant range, with “Sport” and “S line” packages offering cosmetic and performance enhancements.

Chassis & Braking

The A4 Avant g-tron 40 TFSI utilizes a fully independent suspension system, with multi-link setups at both the front and rear. This provides a comfortable ride and good handling characteristics. The suspension is tuned to balance comfort and control, making it suitable for both city driving and longer journeys. Braking is handled by ventilated discs at the front and solid discs at the rear. The braking system is generally effective, providing ample stopping power. The car’s weight (approximately 1590 kg or 3505.35 lbs) is comparable to other A4 Avant variants, and the suspension is designed to cope with this weight effectively.

Market Reception & Comparison

The A4 Avant g-tron was primarily targeted at environmentally conscious buyers in European markets with established CNG infrastructure. Critics generally praised the car’s fuel efficiency and reduced emissions when running on CNG. However, the limited availability of CNG refueling stations and the higher initial cost compared to gasoline or diesel A4 Avants were often cited as drawbacks. Compared to the standard 1.4 TFSI A4 Avant, the g-tron offered similar performance but with significantly lower emissions when running on CNG. Compared to the 2.0 TDI diesel, the g-tron offered a quieter and smoother driving experience, but with slightly lower fuel economy when running on gasoline.

Legacy

The Audi A4 Avant g-tron 40 TFSI represents a relatively short-lived but important experiment in alternative fuel technology for Audi. While production was limited, the g-tron demonstrated Audi’s commitment to reducing emissions and exploring alternative powertrain options. On the used car market, these models are relatively rare and tend to hold their value well, particularly among enthusiasts interested in alternative fuel vehicles. The CVLA engine, when properly maintained, is generally considered reliable. However, the CNG system requires periodic inspection and maintenance to ensure safe and efficient operation. The long-term availability of parts for the CNG system may become a concern as these vehicles age.