S.C. Code Ann. § 12-28-330
The department shall consider it a rebuttable presumption, subject to proof of exemption under Article 7 of this chapter, that all motor fuel subject to the user fee removed from a terminal in this State, or imported into this State other than by a bulk transfer within the bulk transfer terminal system or delivered into an end user's storage tank, is to be used or consumed on the highways in South Carolina in producing or generating power for propelling motor vehicles.