The present invention is a system for providing businesses with comprehensive gas book management capabilities, inclusive of a process for authorizing and tracking gas book expenditures, as well as software for accounting, reconciling and reporting. An overseer runs the software and enters pertinent Request data into a database. The software prints two hard copies of the gas Purchase Order each bearing a unique auto-generated Purchase Order number. One copy is given to the requestor, and one is filed. When purchasing gas, the Requestor exchanges their Purchase Order with a receipt for gas. The requestor returns this receipt to the overseer, who enters pertinent Receipt data into the database. This allows the business to periodically reconcile the database against charge statements received from credit card issuers or gas stations, better manage gas usage, and identify fraud, excessive gas spending, and charge mistakes.