(a) As used in subsection (b) of this section: (1) “Surcharge” means any charge by a retail dealer to any person for the pumping or sale of gasoline or other product intended for use in the propelling of motor vehicles using combustion type engines which exceeds the amount of the posted retail price displayed on such price signs as may be required by law; and (2) “tie-in-sale” means any sale by a retail dealer of any petroleum product, except gasoline, or of any other product or merchandise or of any service which is made a condition for the purchase of gasoline.

(b) Any retail dealer that adds a surcharge to the price of gasoline or other product intended for use in the propelling of motor vehicles using combustion type engines sold by him at retail, or requires a tie-in-sale as a condition of such sale, shall be subject to the penalties provided in § 14-331. Nothing in this subsection shall be construed to prohibit any charge for financing in accordance with sections 36a-675 to 36a-685, inclusive.

(c) (1) During the period commencing on July 1, 1998, and ending on October 1, 1998, upon the reduction in the tax required by § 12-458, that is effective July 1, 1998, and during the period commencing on July 1, 2000, and ending November 1, 2000, upon the reduction in the tax required by said § 12-458, that is effective July 1, 2000, each retail dealer shall, in accordance with subdivision (2) of this subsection, reduce the per-gallon price of gasoline or other product intended for use in the propelling of motor vehicles using combustion type engines sold by such retail dealer at retail in an amount equal to the amount of the reduction in such tax that is imposed on each gallon of such gasoline or other product. Such retail dealer shall maintain any such price reduction in effect for a period of not less than one hundred twenty days after such tax reduction.

(2) The price reduction required by subdivision (1) of this subsection shall take effect not later than (A) two days following the effective date of the applicable tax reduction, or (B) the close of business on the business day on which the retail dealer has completed the sale of an amount of such gasoline or other product equal to the total number of gallons of such gasoline or other product in the inventory of the retail dealer at midnight on the effective date of such tax reduction, whichever is later.

(3) Any retail dealer that violates this subsection shall be subject to the penalties set forth in § 14-331. A violation of this subsection shall be deemed an unfair or deceptive trade practice under subsection (a) of § 42-110b.

(4) The following shall be affirmative defenses to any action or administrative proceeding brought against a retail dealer under § 14-331 or chapter 735a for an alleged violation of this subsection: (A) An increase in the wholesale price of such gasoline or other product that occurs after any such tax reduction; (B) an increase in any other tax imposed on such gasoline or other product that occurs after any such tax reduction; or (C) any other bona fide business cost increase incurred by a retail dealer and upon which the retail dealer relied in making the decision to forego the implementation or continuation of any such price reduction in whole or in part.