The blending of casinghead or natural gasoline is not permitted in an ethanol blend fuel product in quantities larger than required to denature the ethyl alcohol. Notwithstanding this prohibition, a natural gasoline blended product can be made by blending natural gasoline and ethyl alcohol. The natural gasoline blended product shall contain no more than twenty-five percent of natural gasoline and shall contain no less than seventy-five percent of ethyl alcohol. The natural gasoline blended product may only be further blended using gasoline.
SDCL 10-47B-3.1