This report describes the MileageAIDE system for recording the business mileage of a vehicle. The system consists of a mobile application for an Android phone and a hardware device connected to the vehicle’s On-Board Diagnostic port (OBD-II). The two interact via Bluetooth to record the time and odometer value for every trip in the vehicle and remind the user to classify the trip as business or personal. The result is a system that is easy to install, easy to use, inexpensive and keeps detailed and accurate records that are acceptable for reporting to an employer for reimbursement or as business expenses on a tax return. / text