The cost of regular gas in Kentucky is down four-cents a gallon this week. Triple-A says the average price per gallon is two-dollars-and-70-cents today and the national average per gallon is two-83. Drivers in Louisville are paying the most at two-84 a gallon, but that’s down eight-cents from a week ago. The lowest price for gas is posted in Bowling Green at two-54 a gallon.