Idaho Code § 70-1405: Mileage.

Commissioners, agents and employees of port districts, while using their personal vehicles for travel for port purposes, as authorized by the commission, shall be entitled to receive from port funds, mileage reimbursement at a rate per mile to be fixed from time to time by the port commission, but not exceeding the maximum rate allowed to state officials by other agencies of the state of Idaho. Such reimbursement for mileage shall include the mileage of commissioners, agents and employees in traveling to and from their place of residence for attendance at meetings and for all other authorized port purposes.