By JEFF TIRRELL
(GREENFIELD) — Gasoline prices continue to fall here in Massachusetts, albeit slightly over the last few weeks. The average price of a gallon of self-serve regular is $2.13, down two cents from last week. That’s five cents less than the national average, and down from the $2.58 we were paying at this time a year ago, according to AAA Northeast. Federal authorities say demand is currently at its lowest point since mid-June.