With petrol and diesel prices skyrocketing, the demand for cars with alternative fuels - especially ones that don't burn in a hole in the pocket are gaining demand. CNG is one such alternative and Tata has now launched its new 'i-CNG' range of cars in the form of the Tigor compact-sedan and the Tiago compact-hatchback. But is 'i-CNG' unique? Is the Tigor now better to drive? Ninad finds out.