Image source: CVR Refining investor presentation.This past quarter was a tough one for CVR Refining (NYSE: CVRR). Not only is the company dealing with a decline in refining margins as well as the rising costs to comply with the U.S. EPA's Renewable Fuel Standards, but this cost of compliance is so prohibitively high that a majority of CVR's conference call was dedicated to discussing its impact on the income statement and what the company can do to deal with it.Continue reading