PORTLAND — The average retail price of gasoline has fallen nearly a penny per gallon in the past week.

GasBuddy’s daily survey of 1,228 gas outlets in Maine says prices are averaging $2.22 per gallon. The national average has fallen 5 cents per gallon in the past week to $2.16 per gallon.

Maine gas was about 75 cents more expensive per gallon at this time last year, and it was also 1.7 cents per gallon lower than a month ago. The national average dipped 11.4 cents per gallon during the last month and is about 72 cents less than a year ago.