Gas Prices In Tennessee Have Declined For The Past Ten Consecutive Days. According To Triple-A Auto Club Group, There’s Been A Four Cent Discount During That Time. On Average, Tennessee Motorists Spend 40 Dollars For A Full Tank Of Gasoline, Which Is About Six Dollars More Than This Time Last Year. Triple-A Said Motorists Can Expect Additional Declines At The Pump If Oil Prices Drop Again This Week.