Haw. Rev. Stat. § 486H-5: Gasoline dealer's rights.

(a) A petroleum distributor shall not in any way dictate, force, or attempt to set the retail price of any product sold by the gasoline dealer.

(b) After June 7, 1976, it shall be illegal for any petroleum distributor by any action to require a gasoline dealer to purchase only those tires, batteries, and other automotive accessories sold by the distributor. A gasoline dealer may sell any tires, batteries, and other automotive accessories as may be available to the dealer for retail sale.

(c) The petroleum distributor shall at all times act in good faith in carrying out the terms and provisions of the franchise.