Petrol and Diesel prices

We have been seeing petrol ,diesel, kerosene and LPG prices increasing almost every month in India.Now, price of petrol has reached an unprecedented level of Rs 76/77 per litre. The rason given by the Central Govt everytime for this price rise is that crude oil prices have gone up.

I am camping in US for the  for the past 2 months. The price of petrol which was 4 dollars per gallon in the first week of May has gone down to 3.21 dollas per litre at present. If crude oil price rise is the real reason, how can the prices go down in US? One gallon is about 3.76 litres .This means that the price of petrol is less than 1dollar per litre in US  and works out to less than Rs 50 per litre. Either the Government is fooling the people or the real reason is something else and is being hidden from the public  which goes against the principle of transparency in public governance.Can anyone find any rational explanation for this strange phenomenon?