Tennessee Code Title 67. Taxes and Licenses § 67-3-201

(a) Subject to exemptions provided in part 4 of this chapter, a privilege tax is imposed upon all gasoline, fuel alcohol and substitutes therefor, imported into the state; the tax being levied when the product first comes to rest in the state. The tax shall also be imposed on all gasoline or substitutes therefor refined, manufactured, produced, or compounded in this state, and thereafter sold, stored or distributed in this state. The tax imposed by this section shall be collected and paid at those times, in the manner, and by those persons specified in this chapter. The rate of the tax imposed by this section shall be:

(b) No fuel shall be included in the measure of the tax liability under this section unless it shall have previously come to rest within the meaning of the commerce clause of the Constitution of the United States.