Ala. Code § 40-17-328 — Fuels on Which Tax Is Levied; Who Is Liable for Tax

(a) The tax levied pursuant to Section 40-17-325 is levied on all of the following:
(1) Dyed diesel fuel that is used to operate a highway vehicle other than dyed diesel fuel used in city and county vehicles.
(2) Motor fuel that is used to operate a highway vehicle after an application for a refund of tax paid on the motor fuel is made or allowed on the basis that the motor fuel was used for an off-highway purpose.
(3) Aviation gasoline on which a tax was imposed under subdivision (3) of subsection (a) of Section 40-17-325 that is used other than for fuel in an aircraft is subject to the tax rate imposed under subdivision (1) of subsection (a) of Section 40-17-325.
(4) Aviation jet fuel on which a tax was imposed under subdivision (3) of subsection (a) of Section 40-17-325 that is used other than for fuel in an aircraft is subject to the tax rate imposed under subdivision (2) of subsection (a) of Section 40-17-325.
(b) The operator of a highway vehicle that uses untaxed or refunded motor fuel that is taxable under subdivisions (1) and (2) of subsection (a) is liable for the tax. If the highway vehicle that uses the motor fuel is owned by or leased to a motor carrier, the operator of the highway vehicle and the motor carrier are jointly and severally liable for the tax. If the ultimate vendor of motor fuel taxable under this section knew or had reason to know that the motor fuel would be used for a purpose that is taxable under this section, the operator of the highway vehicle and the end seller are jointly and severally liable for the tax.
(c) The licensed aviation fuel dealer selling the aviation gasoline or aviation jet fuel that is not used in an aircraft is liable for the tax owed under subdivisions (3) and (4) of subsection (a).
(d) The tax liability levied by this section is in addition to any other penalty imposed pursuant to this article.