No elective or appointive officer, employee, representative, or agent of this state, or of any of its subdivisions, agencies, bureaus, boards, or commissions, may willfully make claim upon, or willfully receive, any public funds for traveling expenses, while engaged upon public business, in an amount in excess of that allowed by law for such travel. If more than one public officer, employee, representative, or agent travels in the same car while engaged upon official duty, whether belonging to different departments, subdivisions, boards, or commissions or not, no claim may be made for more than one mileage, such claim to be made by the owner or lessee of such car.