I bought santro sportz cng in june 2019. Overall buying experience was very nice as i had exchanged my old hyundai accent executive model 2009 while buying this car.
This car brings a lot of new features and driving is extremely comfortable.
CNG mileage in city area ~22km/kg for cng.
In petrol in city area 12-13 km/pl.
Feature list already explained in above article.