Excess supply of gasoline coupled with slow demand has pressured refiners margins, Reuters reports, noting refining margins for the fuel in the United States sank to US$45.70 a barrel yesterday. The drop follows the fourth weekly increase in gasoline inventories in the U.S., all of them quite hefty, leading to an all-time high of gasoline supplies, at 259.6 million barrels as of January 18. Over the last four weeks, the Energy Information Administration reported gasoline inventory builds reaching a combined 26.6 million barrels. However, the United States is not the only large gasoline hub where inventories are rising as demand...