30-12-409. Sale of gasoline and distillates on other than gross volume basis unlawful -- exception. (1) Except as provided in subsection (2) or in Title 82, chapter 15, part 1, the sale, barter, or exchange of gasoline and distillates on a temperature corrected basis or on any basis other than the gross volume of gasoline or distillate actually delivered is void. Any contract in violation of this section shall be unenforceable to the extent of the violation.

(2) Suppliers of gasoline and distillates shall offer Montana petroleum wholesale distributors the option to buy gasoline and distillates either by gross volume actually delivered or on the assumption that the temperature of the product is 60 degrees Fahrenheit or the centigrade equivalent. This purchaser option may be exercised only on an annual basis and may be applied only to single deliveries of 7,500 gallons or more or the metric equivalent. Any adjustments to volume during the temperature compensation process must be made in accordance with standards set under 82-15-103, 82-15-108, and 82-15-109. Purchasers who choose to exercise the option available under this subsection must be provided with invoice listings of both net and gross gallons.

(3) This section does not apply to the exchange or transfer of gasoline and distillates between refiners or transporters of petroleum or petroleum products.