Section 490.808 - Use of credits to offset petroleum reduction shortfall(a) If a State or covered person granted a waiver under this subpart wants to use alternative fueled vehicle credits purchased or earned pursuant to subpart F of this part to offset any shortfall in meeting the petroleum reduction required under § 490.803(a) of this subpart, it must make a written request to DOE. (1) The State or covered person must provide details about the particular circumstances that led to the shortfall and provide documentation that shows a good faith effort to meet the requirements.(2) DOE may request that a State or covered person supply additional information about the fleet and its operations if DOE deems such information necessary for a decision on the request.(b) If DOE grants the request, it notifies the State or covered person of the credit amount required to offset the shortfall. DOE derives the credit amount using the fleet's fuel use per vehicle data.(c) DOE gives the State entity or covered person until March 31 following the model year for which the waiver is granted, to acquire the number of credits required for compliance with this subpart.