The minimum (R+M)/2 octane rating grades of petroleum products in all counties in the state other than those listed in § 37-2-44 shall be no less than the following: (1) Regular unleaded 87; (2) Midgrade, plus, or super unleaded 89; and (3) Premium, supreme, high test unleaded 91. Source: SL 2013, ch 187 , § 7, eff. Mar. 6, 2013.
Minimum octane rating grades of petroleum in all other counties
SDCL § 37-2-45 — under PETROLEUM PRODUCTS.
SDCL § 37-2-45