As Motorists Have Noticed, Gas Prices Continue To Fall This Week. Tennessee Gas Prices Dropped Another Four Cents During The Past Week. The State Average Has Declined The Last 42 Consecutive Days For A Total Of 32 Cents. Among The Cheapest Gas In The State Is In The Tri Cities, Averaging $2.22 A Gallon. Meanwhile, Virginia Drivers Are Paying On Average $2.25 This Week. Now Virginia Is The Eighth Lowest In The Country To Buy Gas.