16 CFR § 306.9 - Recordkeeping.

You must keep for one year any delivery tickets or letters of certification on which you based your automotive fuel rating certifications. You must also keep for one year records of any automotive fuel rating determinations you made according to § 306.5. They must be available for inspection by Federal Trade Commission and Environmental Protection Agency staff members, or by persons authorized by FTC or EPA.

[58 FR 41374, Aug. 3, 1993]