Sec. 2. The County Superintendent shall make monthly reports showing the kind of automobile operated by him, the number of miles such car was operated during the month in the discharge of the duties of his office, the amounts expended by him in the maintenance thereof, and such other information as may be required of him by the County School Trustees. All such reports shall be audited, and shall be subject to the approval of the County Auditor of such counties, if there be a County Auditor.