Gas prices are more than half-a-dollar lower than the all-time high less than a month ago. Triple-A reports the national average price for regular is down another three cents, to four-60 a gallon. Four weeks ago it was a record five-01. South Carolina and Georgia have the lowest statewide averages at four-11 a gallon. At the other extreme, the statewide average in California is below six dollars a gallon for the first time in almost two months.