Concern that oil production and shipment from the region will remain limited has lifted the price of crude oil — the largest factor in the cost of a gallon of gas — sharply. The price of gasoline in the United States rose again on Tuesday, to an average of $3.54 a gallon, according to data from the AAA motor club, raising the cost of a fuel many Americans purchase frequently. That’s an increase of 19 percent in since the... [1180 chars]