Just toi add fuel to the fire, no pun, 28-5623. Civil penalty; use fuel purchaser; vendor refund; financial penalty prohibited; subsequent violations
A. Notwithstanding any other law, if a person intentionally purchases use fuel for use in a use class motor vehicle that is not exempt pursuant to section 28-5432 from the weight fee prescribed in section 28-5433 and the person pays the use fuel tax rate for a light class motor vehicle, all of the following apply:
1. Except as provided in subsection B of this section, the person is subject to a civil penalty of one thousand dollars or ten dollars for each gallon of use fuel dispensed, whichever is greater, and shall pay to the department the difference between the amount of light class motor vehicle use fuel tax paid and the amount of the use class motor vehicle use fuel tax on the same number of gallons purchased.
And the only exception I found was for a historical vehicle with AZ historical plates, that have lots of restrictions.
