Abstract: A system which enables the user to accurately determine the business and personal usage of a motor vehicle by converting mileage information received from the odometer of the vehicle into an electronic format that is transferable to magnetic disk and compatible with personal computer accounting and database software. The system contains a device for receiving input from the user comprised of an alphanumeric keypad and magnetic disk drive. The system displays information to the user through a liquid crystal or light emitting diode display. A microprocessor correlates information received from the user with information received from the motor vehicle to compute mileage and assign usage of the motor vehicle to an account provided by the user. The microprocessor records the mileage and account information onto a magnetic disk which can be used with personal computer software to determine the total distance traveled, and the costs and expenses associated with the usage of the vehicle.