323.4A  Use of renewable fuel.
  1.  Except as provided in subsection 3, this section applies to a supply agreement or other document executed on or after July 1, 2013, by parties who are receiving and furnishing motor fuel or special fuel as follows:
  a.  A dealer who is a party receiving motor fuel or special fuel from another party who is a refiner, supplier, or distributor furnishing the motor fuel or special fuel.
  b.  A distributor who is a party receiving motor fuel or special fuel from another party who is a refiner, supplier, or other distributor furnishing the motor fuel or special fuel.
  2.  A supply agreement or other document shall not contain a provision restricting a dealer or distributor who is a party receiving motor fuel or special fuel from the other party furnishing the motor fuel or special fuel as described in subsection 1 from doing any of the following:
  a.  Installing, converting, or operating a storage tank or a dispenser located on the distributor’s or dealer’s business premises for use in storing or dispensing renewable fuel. However, this paragraph does not apply to a dealer or distributor whose business premises are leased from the other party furnishing the renewable fuel.
  b.  Using a dispenser to dispense ethanol blended gasoline, including gasoline with a specified blend or a range of blends under chapter 214A, if the dispenser is approved as required by the state fire marshal for dispensing the specified blend or range of blends, including as provided in section 455G.31.
  c.  Purchasing, selling, or dispensing motor fuel or special fuel that is a renewable fuel from a source other than the party furnishing other motor fuel or special fuel, if such party furnishing the other motor fuel or special fuel does not furnish motor fuel or special fuel that is a renewable fuel for sale by the distributor or dealer.
  d.  Marketing the sale of any renewable fuel, including but not limited to advertising its availability or price on a sign, on a dispenser, or by media.
  e.  Selling or dispensing renewable fuel in any specified area located on the distributor’s or dealer’s business premises, including but not limited to any area in which a name or logo of a franchiser or any other entity appears.
  f.  Using a payment form for the sale of a renewable fuel by the retail dealer that is the same type as the payment form used for the sale of another type of motor fuel or special fuel by the dealer on the dealer’s retail premises.
  3.  This section does not apply to any activity that constitutes mislabeling, misbranding, willful adulteration, or other trademark violation by a dealer.
2013 Acts, ch 127, §5
Legislative intent regarding use of renewable fuels; 
2013 Acts, ch 127, §1