Tennessee Gas Prices Start The Week At An Average Of Two Dollars And Seventy-Five Cents Per Gallon, Unchanged From Last Week. According To AAA, Prices Are Five Cents Lower Than A Month Ago And Twenty-Six Cents Lower Than This Time Last Year. The Average Price In Johnson City Is Two Dollars And Seventy-Nine Cents Per Gallon. Tennessee Remains The Seventh Least Expensive Market For Gas In The Nation.