Average retail gasoline prices in Maine rose 0.8 cents per gallon last week, averaging $3.21 per gallon Sunday, Feb. 13.

The national average increased 0.8 cents per gallon in the last week to $3.12 per gallon, according to gasoline price Web site MaineGasPrices.com.

Prices Sunday were 51.5 cents per gallon higher than one year ago and 2.8 cents per gallon higher than a month ago.

The national average increased 4.9 cents per gallon during the last month and 50.4 cents per gallon in the last year.

GasBuddy operates GasBuddy.com, MaineGasPrices.com, and more than 225 other local gasoline price-tracking Web sites that follow prices at more than 125,000 gasoline stations in the United States and Canada. GasBuddy also uses Facebook (facebook.com/gasbuddy) Twitter (twitter.com/gasbuddy), and phone apps to keep motorists ahead of changing gasoline prices. GasBuddy.com was named one of Time magazine’s 50 best Web sites and to PC World’s 100 most useful Web sites of 2008.