By CBSBoston.com Staff

BOSTON (CBS) – Gas prices in Massachusetts reached a new record high for the fourth day in a row Thursday, according to AAA. The average price for a gallon of gasoline in the state is now $4.45.

That’s up one cent from Wednesday and 19 cents in the last week. A year ago at this time it was $1.57 lower at $2.88 a gallon.

The national average is now $4.41 a gallon, also a new record AAA said Thursday. California has the highest average price at $5.85 a gallon.

Diesel prices have also hit a new high in Massachusetts, now averaging $6.31 as of Thursday.

CBSBoston.com Staff