Gas prices are up slightly in Pennsylvania. As reported by Triple-A, the average price for a gallon of regular rose incrementally to just over four dollars and one cent on Friday, as the national average also rose to settle at three-79 a gallon. Prices remain lowest in Georgia, where Peach Staters were paying an average of three-13 a gallon on Friday. At the other extreme, prices remain highest in California. Yesterday’s state average dipped slightly to just under five-36 a gallon.