I'm not sure if everyone noticed that Transfer data values are somehow not always true,
I have a 2x APs running in my house, and this morning i had only 1 iphone connected to the network, by the after noon i connected a new android device to the wifi, and then the magic happened, the data transfer jumpped from 430MB to 700MB,
in addition i also noticed that appel location application is consumming around 300MB over the WiFi, which seems to be too hight,
i tried to monitor this week the devices' behavior, same results, looks that values showing in dashboard aren't real, because in just a small time frame i may see megs of Data comsumption
in addition i agree with you about apps that use only wifi, because i can see lot of data consumption from 'apple location'.
have you ever notice same behaviour in an AIO ?