@crazy car u LOL
lets say yr car do 3rp/kilometer and u driver around 1000 km a month wich is normal....so u spend 3000 rupees a month..plus lots of tunning will make it around 4,000 a month
and on petrol u will get around 15km/liter...so u need 67 liter a month costing u almost 5500 rupees
so u paying just 1500 extra or cut the the tunning price to 500...now u paying 2,000 extra
now if u have 60,000 in hand and u can sell yr CNG for around 40,000
so u can actually speand yr next 4 to 5 years on petrol with god performance.....