Diesel is the king?

I hate to talk in stats or rather numbers but in a recent articles I read that petrol variants are struggling to sell while their diesel sibling are selling like hot cakes in almost every segment of cars in India. For example in the hatchback segment the ratio of petrol to diesel is 80:20. That doesn't sound so strange as the city where I live diesel(45 Indian rupees per liter) is almost 22 Indian rupees more costlier than petrol(67 Indian rupees per liter). So suppose if you drive a petrol hatchback in a city for which it is usually meant for and gives you a decent fuel economy of 12 kmpl(i.e. kilometer per liter) and your daily run is 40 kmpl(since my city is not a big one) you blow 3.33 liter of petrol which costs you 223 Indian rupees practically  it doesn't when you include the fuel wasted in traffic jams etc. Now you take the same hatchback with the diesel engine giving you an efficiency of 14 kmpl, you end up consuming 2.86  liter of diesel which costs 129 Indian rupees which gives a difference of 94 Indian rupees. Which sums up to roughly to 2820 Indian rupees in a month's run or 33840 Indian rupees in a year which is roughly half the amount you paid extra for the diesel variant over the petrol one of the same hatchback. So we see the diesel rules in as long as it is India. Still I cant see any automaker coming up with a petrol engine that is more efficient than a diesel engine of same displacement. Period.