Average retail gasoline prices in Georgia have risen 2.3 cents per gallon in the past week, averaging $3.70/g Monday. This compares with the national average that has increased 5.2 cents per gallon in the last week to $3.71/g, according to gasoline price website AtlantaGasPrices.com. In Covington Tuesday, the average gas price was $3.65 with the lowest price, $3.61, at a Shell station on Covington Road.