PORTLAND – The start of a new week is bringing lower gas prices to motorists in Maine and across the country.

According to AAA, which tracks prices nationwide, a gallon of regular self-serve gas was averaging $3.16 on Monday. That’s down 4 cents from Sunday and 51 cents from a month ago. But it’s still 33 cents higher than last year at this time.

The price of diesel is also going down. AAA says a gallon of diesel on Monday was selling for $3.82 on average in Maine, down from $4.20 a month ago.

Nationally, a gallon of gas was averaging $3.21 a gallon.