Gas prices are up again this week in Massachusetts. Self-serve, regular unleaded gasoline is averaging $2.57 per gallon, three cents more than last week.

“In spite of a drop in crude oil prices last week, generally higher crude oil prices, coupled with the seasonal switch to the summer gasoline blends – which are more expensive for refiners to produce – are combining to boost the cost of fuel at the pump,” said Mary Maguire, Director of Public and Legislative Affairs.

Although gas prices are up, the Massachusetts price is still nine cents below the national average of $2.66 per gallon.

A year ago at this time, the average price in Massachusetts was 33 cents lower at $2.24.

The range in prices in the latest AAA survey for unleaded regular is 37 cents, from a low of $2.42 to a high of $2.79. AAA advises motorists to shop around for the best prices in their area, and to make sure they and their passengers buckle up — every time.

Today’s local gas prices and their ranges are as follows:

Self Serve                                        Grade                        

$2.57 ($2.42-$2.79)                         Regular Unleaded                  

$2.79 ($2.63-$2.99)                         Midgrade Unleaded               

$2.97 ($2.77-$3.25)                         Premium Unleaded                

$2.97 ($2.89-$3.09)                         Diesel