► 2017 Audi A4 g-tron

Scheduled to launch in late 2016, the A4 Avant g-tron is yet another offer from Audi for the sustainable mobility of the future. It follows the A3 Sportback g-tron as the brand’s second model to use natural gas or climate-friendly Audi e-gas.
The A4 Avant g-tron is simultaneously sporty, efficient and extremely economical. The engine is based on the new 2.0 TFSI featuring an advanced, highly efficient combustion process developed by Audi. The turbocharged power plant produces 125 kW (170 hp). Maximum torque of 270 Nm (199.1 lb-ft) is available at approx. 1,650 rpm. The pistons and valves have been specially modified for gas operation and allow for an optimal compression ratio. An electronic controller reduces the high pressure of the gas flowing from the tank from as much as 200 bar to a working pressure of 5 to 10 bar in the engine. This pressure control function is performed dynamically and precisely in response to the power requested by the driver. The correct pressure is always present in the gas line and at the injector valves – low pressure for efficient driving in the lower speed range, and higher pressure for more power and torque.
In the NEDC, the Audi A4 Avant g-tron consumes less than four kilograms CNG (compressed natural gas) per 100 kilometers (8.8 lb), corresponding to customer fuel costs of roughly four euros (as of: October 2015). CO2 emissions are less than 100 grams per km (160.9 g/mile). The tank capacity of 19 kilograms (41.9 lb) of gas allows for a range of over 500 kilometers (310.7 mi). When the amount of gas remaining drops below approx. 0.6 kilograms (1.3 lb) – analogous to a residual pressure of 10 bar – the control unit switches to gasoline operation. The bi-fuel A4 Avant g-tron can cover an additional 450 kilometers (279.6 mi) in this mode. The potential overall range is comparable to that of a car with a TDI engine.
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