(a) Definition.
(1) Any substance, other than one composed solely of carbon and/or hydrogen, that is intentionally added to diesel fuel (including any added to a motor vehicle's fuel system) and that is not intentionally removed prior to sale or use.
(2) Neat biodiesel, also referred to as B100, when used as an additive. Diesel fuel additive does not mean neat biodiesel when used as a fuel or blended biodiesel fuel (e.g., B20).
(b) Minimum biobased content. The minimum biobased content is 90 percent and shall be based on the amount of qualifying biobased carbon in the product as a percent of the weight (mass) of the total organic carbon in the finished product.
(c) Preference effective date. No later than March 16, 2007, procuring agencies, in accordance with this part, will give a procurement preference for qualifying biobased diesel fuel additives. By that date, Federal agencies that have the responsibility for drafting or reviewing specifications for items to be procured shall ensure that the relevant specifications require the use of biobased diesel fuel additives.
[71 FR 13705, Mar. 16, 2006, as amended at 73 FR 27953, May 14, 2008]