It is always better to use Petrol Car than Diesel Car for those who have less use of Car. Like family people other than for commercial use. Here consumption of fuel does not matter but the comfort is more important. Diesel vehicle needs more maintenance and it needs to start up frequently otherwise the engine will not respond. Normally the family visits are once in a week or twice. For that Petrol Car is OK. Moreover, the cost difference between Petrol and Diesel is not much. thus mileage of vehicle is more or less same. On the other hand, if Diesel is used less, that can be utilized for the big vehicles for commercial use which ultimately reduces the transportation cost of goods. It is also observed that the Cars are being used as Luxury needs mostly. so the persons who can afford to buy a Car can also afford to buy Petrol. thus in interest of nation also we should use Petrol cars often.