The average price for gas in Massachusetts is $3.659 a gallon in the latest weekly AAA survey, down 6 cents from the previous week’s average, AAA Southern New England said Monday.

It is the fifth straight week of decreases, AAA Southern New England said.

The current national average price is $3.68 a gallon. A year ago at this time, the Massachusetts average price was $3.88, AAA Southern New England said.

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AAA weekly surveys focus on self-serve, regular unleaded gas.