Hawaii Revised Statutes Division 2. Business § 437D-14

(a) Except as provided in this section, refueling charges are prohibited.

(b) Upon the lessee's return of the vehicle, if the amount of fuel remaining in the vehicle is less than the amount originally provided by the lessor, the lessor may charge the lessee to refuel the vehicle based upon the number of gallons or liters used by the lessee. The amount of fuel that may be charged to the lessee shall be calculated in one of two ways:

(c) Upon the lessee's return of the vehicle, if the amount of fuel remaining in the rental vehicle is greater than the amount originally provided by the lessor upon delivery of the vehicle to the lessee, the lessor shall credit the lessee an amount based on the gallons or liters added by the lessee, calculated by the method set forth in subsection (b)(2).

(d) In the event that the lessor has no reasonably accessible refueling facilities, the lessor is not required to give the credit to the lessee as described in subsection (c); provided that if no credit is given, the lessor shall disclose that fact to the lessee at the time the rental agreement is signed.

(e) The lessor shall provide the lessee with written notice of the amount to be credited, except as provided in subsection (d), or charged on a per gallon or per liter basis.

(f) The price per gallon or per liter that is charged for the amount of fuel required to refuel the vehicle, as provided in subsection (b), shall not exceed the average of the locally prevailing retail market price for similar fuel sold at self-service gasoline pumps by commercial gasoline dealers and a reasonable surcharge not to exceed one-half of that retail price.

(g) The per gallon or per liter amount that is credited pursuant to subsection (c), except as provided in subsection (d), may not be lower than the locally prevailing retail market price for similar fuel sold by commercial gasoline dealers.

(h) Nothing in this section shall prohibit the lessor from offering the lessee the option of purchasing, at the time of taking delivery of the vehicle, a full tank of fuel from the lessor at a price per gallon or per liter that shall not exceed the average of the locally prevailing retail market price for similar fuel sold at self-service gasoline pumps by commercial gasoline dealers; provided that the option includes the provisions that: