The price per gallon for regular unleaded gasoline has increased 29 days in a row as of Tuesday because of U.S. refinery issues and commodity markets, AAA said. AAA reports an average national retail price for a gallon of gasoline at $2.31, up about a penny from Monday and 28 cents from one month ago. Gasoline prices dropped steadily during the latter half of 2014 as oil prices traded in a bear market, though it was Jan. 26 last time prices at the pump fell . The motor club said in a Monday report that some of the increase is tied to seasonal maintenance at U.S. refineries, which limits fuel production and crimps supplies. Refineries in […]