Hyundai is one of the most popular car brands. Why? Because their vehicles are small and safe a lot of fuel. Ideal for a city auto. Well to have a better environment, car brands are looking for alternative fuel options, like compressed natural gas. Also Hyundai is working on a car that will use CNG (Compressed Natural Gas).
The model they use for this project is the Hyundai Santro Xing. They call it the Hyundai Santro Xing XK. The Hyundai Santro Xing is one of the most popular cars in its segment.
Hopefully they will release more info about this car soon, so we know about this car.
On the website of CarFuelOptions you can find more information about CNG.