Summer Gas Prices Continue To Be The Highest In Four Years. According To Triple-A, Gas Prices In Tennessee Increased 1.5 Cents During The Past Week. Since June 1st, Tennessee Gas Prices Averaged $2.64 Per Gallon, An Increase Of Nearly 60 Cents Compared To The Average Price Last Summer. Current Pump Prices Remain 12 Cents Below This Year’s High, Set During Memorial Day Weekend.