The price of gasoline in Rhode Island is up four cents this week.AAA Northeast said Monday in its weekly survey that self-serve regular is averaging $2.60 per gallon. That's six cents below the national average of $2.66. The average price of gasoline in Rhode Island is 35 cents higher than it was at this time last year, when it sold for $2.25 per gallon. AAA found gas selling for as low as $2.51 per gallon and as high as $2.71 in Rhode Island. AAA says gas prices are rising across the country due to the change in season.