PORTLAND — Gas prices in Maine have risen 2.3 cents per gallon in the past week.

The average retail gas price in Maine was $2.80 per gallon on Sunday. The figure is based on a GasBuddy.com survey of 1,228 gas outlets in the state. The national average price fell 1.1 cents per gallon in the last week to $2.80 per gallon.

Maine gas prices on Sunday were 93 cents per gallon less than the same day in 2014 and 12.2 cents per gallon higher than a month ago. The national average price increased 5.4 cents per gallon during the last month and is 88.9 cents per gallon lower than a year ago.