Gas prices are down slightly throughout Pennsylvania. As reported by Triple-A, the average price for a gallon of regular fell yesterday to a little over three dollars and 62 cents, as the national average increased to about three-28 a gallon. Prices are currently lowest in Mississippi, where Friday’s statewide average rose to a little over two-88 a gallon. At the other extreme, prices remain highest in Hawaii, where yesterday’s statewide average fell slightly to a few tenths above five dollars per gallon.