Average gasoline prices in Tennessee have risen 7.5 cents per gallon in the last week, averaging $3.31/g today, according to GasBuddy's survey of 3,821 stations in Tennessee. Prices in Tennessee are 12.2 cents per gallon higher than a month ago and stand 21.0 cents per gallon higher than a year ago. The national average price of diesel has dropped 3.4 cents in the last week and stands at $3.94 per gallon.The national average price of gasoline has fallen 1 cent per gallon in the last week, aver ...