After dilly dallying for weeks I finally mustered courage to spend money on the CNG kit. I live in Noida and travel to Delhi everyday. Avg travel is 60 Kms a day(add to it the horrific traffic).
My Zen was giving me 11 kms per liter on petrol.
I went in for a Lovato Kit and its been 250 Kms on CNG now. Everything has been flawless. Except for slight pick up issues which believe me is nothing when you would feel the pleasure of saving money on every KM you drive:)
A tank fill of CNG(8Kgs, around 290 Rs) gives me 150 Km of drive(70% of it is with AC on).
Hope that helps to someone who is looking for info.