Mass. gas prices jumped 15 cents a gallon

Gasoline prices in Massachusetts were up an average of 15 cents in the last week, according to AAA Southern New England.

AAA said its May 26 survey of prices in Massachusetts found self-serve, regular unleaded averaging $3.90 per gallon, up 36 cents in just the last month.

Massachusetts is currently 3 cents below the national average for regular unleaded of $3.93, AAA said.

A year ago at this time, the average price in Massachusetts was $3.04, AAA said.
(By Chris Reidy, Globe staff)