U.S. refinery issues and recovery for oil prices means retail gasoline prices are closing in on their highest levels since December, market analysis finds. Motor club AAA reports a national average retail price for a gallon of regular unleaded gasoline at $1.98 per gallon for Tuesday, steady from the previous day but 4 cents higher than last week and 27 cents, or 16 percent, higher than one month ago. According to AAA, it’s the second straight week for increases in prices at the pump . The motor club said the onset of spring coincides with a period when refineries are conducting maintenance as they ready to prepare a summer blend of gasoline, which because of additional environmental safeguards […]