Abstract: In an electronic odometer for a wheeled vehicle, a non-volatile memory circuit includes a main memory having 256 cells in sequence for non-volatilely storing first data indicative of a unit mileage of the vehicle upon each application of the first data to the memory circuit. The memory circuit also includes an auxiliary memory having 32 cells in sequence for non-volatilely storing second data indicative of 256 times of the unit mileage upon each application of the second data to the memory circuit. A microcomputer repetitively determines the unit mileage in relation to the actual vehicle speed to search each cell of the main memory as to storage of the first data in each cell of the main memory. The microcomputer applied the first data to the memory circuit upon each search of no storage of the first data in at least one cell of the main memory and also applies the second data to the memory circuit upon each search of storage of the first data in each cell of the main memory.