This is a great car indeed. BUt as far as CNG concerned , a big NO is the answer because my friend is an engineer in Landi renzo company and he told me that IDSI+CVT = PTEROL ONLYYYYYYYYYY.
It has the same transmission as locally produced IDSI city vario and you can ask any vario owner about horror stories of CNG conversion.
After installing CNG within 10 to 20000 Kms you gear will be worn out and its replacement will cost you around 80 to 90000 rupees.