Conn. Gen. Stat. § 12-462a
Exempt dyed diesel fuel.
(b) Each distributor of dyed diesel fuel shall, on or before the twenty-fifth of each month, render a report to the commissioner. Such report shall state the number of gallons of dyed diesel fuel sold or used by such distributor during the preceding calendar month, on forms to be furnished by the commissioner, and shall contain such additional information as the commissioner prescribes.