As used in this part:
Note to paragraph (i): Provided, however, that biodiesel blends and biomass-based diesel blends that contain less than or equal to 5 percent biodiesel by volume and less than or equal to 5 percent biomass-based diesel by volume, and that meet ASTM D975-09b, Standard Specification for Diesel Fuel Oils (incorporated by reference, see § 306.13 ), are not automotive fuels covered by the requirements of this part.
16 C.F.R. §306.0