The cost of regular gas in Kentucky is up a nickel a gallon from a week ago. Triple-A says the average price per gallon is two-dollars-and-72-cents today, while the national average is two-83. Drivers in Covington are paying the most in the state at two-83 a gallon, 12-cents higher than last Friday. The lowest prices are posted in the Huntington-Ashland at two-56-a-gallon.