DOE shall allocate to a fleet or covered person one credit for each qualifying volume of the biodiesel component of a fuel that contains at least 20 percent biodiesel by volume if:
Each qualifying volume of the biodiesel component of a fuel was purchased after November 13, 1998;
The biodiesel component of fuel is used in vehicles owned or operated by the fleet or covered person; and
The biodiesel component of the fuel is used in vehicles weighing more than 8,500 pounds gross vehicle weight rating.
No credit shall be allocated under this subpart for a purchase of the biodiesel component of a fuel if the fuel is:
For use in alternative fueled vehicles which have been used to satisfy the alternative fueled vehicle acquisition requirements under Titles III and V of the Energy Policy Act of 1992; or
Required by Federal or State law.