The current Android Auto band algorithm seems to just switch based on which freq. band has the highest signal (dBm) level even though a 2.4 GHz AP with a high signal level will often be slower than a 5 GHz AP with a lower signal level due to the high number of 2.4GHz devices completing for bandwidth.
A search for WiFi priority apps only seems to yield setting priority by SSID and an app that would allow setting priority by MAC address would be invaluable as I could then prioritize all the 5GHz APs. If the Wifi Auto band algorithm itself allowed a 10 dBm signal threshold advantage to the 5 GHz band before switching to 2.4 GHz band, real life WiFi performance would likely be overall higher.
Thanks, this is my first post on XDA.