Tennessee Gas Prices Took A Slide This Past Week. According To Triple-A, Gas Prices In The Volunteer State Declined Two Cents To End With A State Average Of $2.63 Per Gallon, Which Is The Lowest In The 9th Lowest In The Nation. However, Oil Analysts Forecast Significant Volatility In The Oil Market Through The End Of The Year, Leaving A Big Question Mark For The Long-Term Direction Of Prices At The Pump.