Tata teases something new on the Tiago and Tigor CNG It seems like Tata is going to offer an AMT option on these two Cng Cars and become the first manufacturer to offer a Cng Automatic option.The teaser provides a clear indication of the forthcoming integration of the AMT gearbox with CNG cars. Specifically, the Tiago and Tigor CNG models are set to receive the automatic gearbox,