Gasoline prices in Massachusetts are down one cent this week, according to AAA Northeast.

AAA Northeast’s December 9 survey of prices in Massachusetts finds self-serve, regular unleaded averaging $2.50 per gallon. Massachusetts’s price is 7 cents below the national average of $2.57. A year ago at this time, the average price in Massachusetts was 12 cents higher at $2.62 per gallon.

“Since the end of October, gasoline demand has mostly decreased as gasoline stocks have mostly increased, paving the way for cheaper gas prices,” said Mary Maguire, Director, Public and Legislative Affairs. “AAA expects stocks to continue to grow and drive gas prices even cheaper through year-end.”

The range in prices in the latest AAA survey for unleaded regular is 73 cents, from a low of $2.32 to a high of $3.05. AAA advises motorists to shop around for the best prices in their area. Please remember to slow down and move over for any emergency vehicles on the side of the road.

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

Self Serve                                           Grade

$2.50 ($2.32-$3.05)                            Regular Unleaded

$2.83 ($2.59-$3.09)                            Midgrade Unleaded

$2.99 ($2.76-$3.39)                            Premium Unleaded

$2.96 ($2.69-$3.25)                            Diesel

Find the most up-to-date local gas prices with the AAA Fuel Finder by logging onto AAA.com and clicking on Gas Saving Tips & Tools.