Massachusetts gas prices remain unchanged, still 6 cents per gallon above the national average

The cost of a gallon of gasoline in Massachusetts remains unchanged.

AAA Southern New England reports Monday that self-serve, regular remains at $3.67 a gallon, the same as last week.

The Massachusetts price is 6 cents above the national average, 3 cents higher than a month ago and a nickel higher than a year ago.

AAA found self-serve regular selling as low as $3.55 per gallon and as high as $3.89.