Section 526.307 - Unfair practices unlawful(1) It shall be unlawful for a refiner or other supplier to fix or maintain the retail price of motor fuel at a retail outlet supplied by that refiner or supplier. Nothing herein shall be construed to prevent a refiner or supplier from counseling concerning retail prices, provided no threat or coercion is used in the counseling. This subsection shall not apply to retail outlets operated by the refiner or supplier.(2) It is unlawful for a supplier supplying motor fuel to a person for resale and leasing a retail outlet to the person to impose any material modification in the contractual arrangements during the term of the contract, including a material modification of the leased retail outlet, unless such modification is made in good faith and based upon reasonable business practices.