(a) General rule. Except as provided in paragraph (b) of this section, the vehicle acquisition mandate schedule in section 490.302 of this part applies to all light duty motor vehicles newly acquired for use within the United States by a covered person described in section 490.303 of this part.

(b) Exception. If a covered person has more than one affiliate, division, or other business unit, then section 490.302 of this part only applies to light duty motor vehicles newly acquired by an affiliate, division, or other such business unit which is substantially engaged in the alternative fuels business.