Washington Post: The nation’s ethanol producers are urging the Obama administration to raise the 10 percent limit on ethanol in motor fuel to 15 percent or more, a move they hope will create new demand at a time when many distilleries are idle. The producers say higher ethanol blends would help create jobs and reduce petroleum imports. Moreover, without a change in the 10 percent limit, ethanol makers say it could be difficult to fulfill a congressional mandate for renewable fuel use and the makers of …