Gasoline prices in Massachusetts are down four cents this week, according to AAA Northeast.

AAA Northeast’s April 27 survey of prices in Massachusetts finds self-serve, regular unleaded averaging $1.90 per gallon. Massachusetts’s price is thirteen cents above the national average of $1.77. A year ago at this time, the average price in Massachusetts was 89 cents higher at $2.79 per gallon.

“AAA forecasts that the national average will continue to decrease into next month, possibly dropping as low as $1.65,” said Mary Maguire, Director, Public and Legislative Affairs. “We haven’t seen gas prices that cheap around the country since early in 2009.”

The range in prices in the latest AAA survey for unleaded regular is 97 cents, from a low of $1.42 to a high of $2.39. 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

$1.90 ($1.42-$2.39)                            Regular Unleaded

$2.27 ($1.89-$2.82)                            Midgrade Unleaded

$2.46 ($2.07-$2.99)                            Premium Unleaded

$2.67 ($2.39-$3.29)                            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.