Associated Press: Ethanol producers asked the Environmental Protection Agency on Friday to boost the amount of ethanol that can be blended with gasoline, but automakers argued the increase could damage car engines and fuel lines. The ethanol producers want the EPA to increase the amount of ethanol that refiners can blend with gasoline from a maximum of 10 percent to 15 percent, which could boost the demand for the renewable fuel additive by as much as 6 billion gallons a year. “Increasing the …