Gas in the Boston area is down 6¢ from last week, now averaging $4.27 a gallon. Filling a 15-gallon tank in the Boston area costs about $19 more than a year ago. It is $4.27 a gallon, $1.26 more than a year ago. Filling a 15-gallon tank costs about $19 more. It is $4.27 a gallon, down 6¢ from last week but still $1.26 above a year ago. Prices are AAA's daily averages for regular gas, last updated October 20.

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