Motorists Are Seeing Steady Discounts At The Gas Pump This Week, With Prices Steadily Sliding Lower. Tennessee Gas Prices Have Declined Seven Cents In The Past Few Days To Average $2.34 A Gallon. Stephanie Milani With AAA Auto Club Says The Market Has Seen Significant Gains In Oil And Gas Production In The United States In The Part Week Or So. Johnson City Has Among The Most Expensive Gas This Week Averaging $2.37 A Gallon.