Associated Press: BP CEO Tony Hayward says the reservoir that feeds the gushing well in the Gulf of Mexico probably still holds about 2 billion gallons of oil. Appearing before a House subcommittee, Hayward estimated that the reservoir tapped by the out-of-control well holds at least 50 million barrels of oil. At 42 gallons per barrel, that’s 2.1 billion gallons. According to government estimates of daily flow figures, anywhere from 73.5 million to 126 million gallons gushed from the breached …