All manufacturers, jobbers, wholesalers, retailers and others who distribute gasoline at retail level and desire to designate the various grades or brands by numbers shall not display or use any number for the grade or grades or brand name other than the registered octane count for such grade or grades or brand name, except where a legible statement is affixed to all pumps dispensing such grade or grades indicating that such number or numbers do not represent octane numbers.
Such statement shall be readable at a reasonable distance from the dispensing pump or pumps and shall be affixed to the dispensing pump at a place thereon clearly visible to the occupant or driver of the vehicle buying the petroleum product. The statement indicating that such number or numbers do not represent or correspond to octane numbers shall be in letters no smaller than 3/4 inches in size and shall be in a color that is in clear contrast with the background. For the purpose of complying with this regulation, a decal in size of not less than 6"'' × 7"'' affixed to the dispensing pump or pumps shall be deemed a sufficient compliance.
This same requirement shall apply to any form of advertising such as billboards, posters, banners, and newspaper advertisements, which advertisement shall include a statement that the numbers used do not indicate or represent the actual octane. (The effective date of this regulation shall be July 10, 1964.)
S.C. Code Regs. 5-440