With Each Passing Day, The Price Of Gasoline Gets More Expensive. Gas Prices Have Jumped 23 Cents Nationwide, And 29 Cents In Tennessee In The Past 20 Days. This Week, The National Average Price Of Gas Is At $1.98, While Tennessee Motorists Are Paying On Average $1.81 Per Gallon. AAA Forecasts That Gas Prices Could Rise A Total Of 30 To 50 Cents A Gallon By Memorial Day Weekend.