 The slight increase came as Hurricane Beryl hit the coast of Texas. A record number of Americans traveled by car over the July 4th holiday, and oil costs continue to hover above $80 per barrel. Today's national average is 7 cents more than a month ago, but 4 cents less than a year ago. The average price per gallon for self-serve unleaded in Louisville stands at $3.58 a gallon. In Elizabethtown, that same gallon of gas costs you $3.29. Owensboro comes in at the lowest per gallon at $3.01.