Generally common vehicle users consider three factors, Price, Oil Change Interval & CNG Installation

Fuel Price:
Petrol Rs: 101/L
Diesel Rs: 113/L

Preventive Maintenance@
Petrol: 3500 KM with non-synthetic oil
Diesel: 3000 KM with non-synthetic oil

CNG Installation:
Petrol: Can be fitted
Diesel: Cannot be fitted (Generally people think that, however may not be true)

Please share your experience, Which type will you prefer and why?