The average price of a gallon of gas in Rhode Island has fallen another 5-cents to it's lowest of the year. AAA Southern New England's weekly price survey Monday found the average cost of a gallon of self-serve regular in the state fell to $3.43. The lowest it had been this year was $3.44 in early February. The local price is down 9 cents in the last month. Still,the Rhode Island average is 9 cents more than the national per -gallon average. Rhode Islanders were paying an average of 21 cents more per gallon a year ago.