Determining a fuel card usage exception with the use of a computer that receives fuel card transaction data responsive to a fuel purchase event. The fuel card transaction data identifies a quantity of fuel purchased for a vehicle using a fuel card. In addition, the computer receives first fuel level data and second fuel level data of the vehicle that identifies a quantity of fuel present in a fuel tank of the vehicle prior to a fuel purchase event and after a fuel purchase event respectively. The computer can determine an exception associated with the fuel purchase event based on the fuel card transaction data, the first fuel level data, and the second fuel level data. Responsive to detecting an exception associated with the fuel purchase event, the computer may generate an alert and transmit the alert for presentation by a computing device of a user.