Oil Prices Have Reached New Heights, Causing A Bump In The Road For Falling Gas Prices. Tennessee Gas Prices Have Climbed A Full Cent Overnight. The State Average Is $2.24, With Johnson City Having Among The Least Expensive Gas At $2.17 A Gallon. Stephanie Milani With Aaa Said For The First Time Since June 2015, The Price Of Oil Exceeded 60 Dollars A Barrel.