It is June, halfway through CY 2013, and thus far no required volume obligations (RVOs) have been set for the Renewable Fuel Standard (RFS). The U.S. Environmental Protection Agency (EPA) on 1 February issued proposed levels that were subject to a 45-day comment period, which has long elapsed, and a public hearing on 8 March.EPA noted that the 2013 mandates could be met with carryover Renewable Identification Numbers (RINs). However, 2014 would be more difficult because the inventory of RINs would be depleted and because lower ethanol production would not be sufficient to rebuild that supply -- especially as the RFS grows. This summer the EPA will finalize the 2013 limits and propose 2014 mandates. The RFS calls for 18.15 billion gallons...