86.1201-90—Applicability.
(a)
The provisions of this subpart are applicable to new gasoline-fueled, natural gas-fueled, liquefied petroleum gas-fueled and methanol-fueled heavy-duty vehicles.
(b)
Provisions of this subpart apply to tests performed by both the Administrator and motor vehicle manufacturers.
(c)
Test procedures and equipment other than those described in this subpart may be used by the vehicle manufacturer if shown to yield results which correlate with results yielded by those described in this subpart (with the reference driving schedule described in § 86.1215-85(a)) and if approved in advance by the Administrator.