BOSTON (AP) — The cost of a gallon of gas in Massachusetts has dropped by four cents in the past week.

AAA Southern New England reports Monday that self-serve, regular is selling for $3.72 per gallon. That's two cents below the national average but still 13 cents higher than a month ago and a penny below the price a year ago.

AAA found self-serve, regular selling for as little as $3.59 per gallon and as high as $3.89.