The amount of refund allowed is thirty-three and one-third percent (33 1/3%) of the tax rate in effect under G.S. 105-449.80 for the time period for which the refund is claimed less the amount of sales and use tax due on the fuel under this Chapter. An application for a refund allowed under this section must be made in accordance with this Part. This refund is allowed for the amount of fuel consumed by the vehicle in its mixing, compacting, or unloading operations, as distinguished from propelling the vehicle, which amount is considered to be one-third of the amount of fuel consumed by the vehicle.
N.C. Gen. Stat. § 105-449.107