(Heathrow, FL)  —  Gas prices are down another penny.  Today’s decline brings the national average price for regular down to four-23 a gallon, according to Triple-A.  And the statewide average is now below four dollars a gallon in 16 states, led by Kansas and Missouri where the statewide average is three-76 a gallon.  Drivers in California are still seeing the highest prices in America at five-87 a gallon.