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FMx001 (FMC001, FMM001, FMB001) devices will have the full OEM OBD reading feature once upgraded to the latest firmware version 03.27.12.Rev.143
To get the total mileage value of the vehicle the device with OEM OBD support should be used, like FMB003 or FMC003, as they have the ability to request the total mileage value of the vehicle by sending a specific PID, please note, that there is OEM supported list, which has all support vehicle and their parameters list, please refer to the following page: https://wiki.teltonika-gps.com/images/4/4a/FMX003_Supported_Vehicles_20230109.pdf