For reference, let's take a petrol and a diesel car with fuel efficiency of 15km/l and 20 km/l, respectively.
In general, petrol costs around Rs 97 per liter and diesel around Rs 89 per liter.
For a daily commute of 50 km, this results in a daily fuel cost of Rs 323 for petrol car and Rs 223 for diesel car.
It translates into a monthly expense of Rs 9,700, and an annual cost of Rs 118,015 for a petrol car.
Commuting 50km with a diesel Car brings the monthly expenditure to Rs 6,675, and the yearly expense to Rs 81,213.
For a daily commute of 50 km, the yearly fuel cost difference between a petrol and a diesel car is significant at approximately Rs 36,802.
This saving is substantial and could offset the higher initial purchase price of diesel cars within a few years.