Higher crude oil prices and seasonal maintenance at U.S. refineries means gasoline prices have increased for 20 straight days, motor club AAA said. AAA reports a national average retail price for a gallon of regular unleaded gasoline at $2.63 per gallon, a 3.5 percent increase from last week. Gas prices Tuesday are 10 percent, or 24 cents, more per gallon than they were a month ago and mark the 20th consecutive day for an increase in price at the pump . Spring prices are typically elevated as refineries conduct seasonal maintenance and switch over to a summer blend of gasoline, which is more expensive to produce because of additional environmental safeguards. “Unexpected refinery issues are also […]