Gasoline prices in Rhode Island are down 2 cents this week but remain above the national average, according to AAA Northeast's weekly survey.The price of self-serve, regular unleaded gas is averaging $2.93 per gallon, 4 cents above the national average of $2.89, according to the agency's June 18 survey. A year ago at this time, the average price in Rhode Island was 64 cents lower, at $2.29 per gallon.“The next factor that may influence gas prices is this Friday’s [...]