Currently, there are only three CNG-automatic cars on sale: the Tata Tiago, Tata Tigor, and Nissan Magnite. The Tata cars offer usable boot space since their CNG tanks are placed under the floor, while the Magnite’s tank eats into the boot space. However, the Magnite is larger and has a more spacious cabin. In terms of pricing, the Tiago is the most affordable, while the Magnite is the costliest.