There is not much difference in procurement-price of diesel and petrol. But diesel is deliberately kept cheaper because it is used in transportation of goods and public. There is no sense and logic in passing on benefit of cheap fuel (diesel) to car-owners that too with most of costly and luxury cars now-a-days fitted with diesel engines.
Central government should impose a total ban on any further production of diesel-driven cars in the country. Rather CNG being considered environmental-friendly fuel, compulsion of further production of cars with company-fitted CNG kit can also be considered. It will benefit consumers also because in days of odd-even, CNG fitted cars are allowed on days of week. Also cost of running with CNG is comparatively less than through petrol and diesel.
(The views expressed by the author in the article are his/her own.)