The average price of petrol in the United States was 42.2 percent higher in May than a year earlier, according to figures released by the US Transportation Department.

U.S. gasoline inventories are falling at a record pace, raising questions about summer fuel prices, refinery capacity, and energy market risks.

The average price of petrol in the United States was 42.2 percent higher in May than a year earlier, according to figures released by the US Transportation Department.