I did my first test since LG8 update. After a fully saturated charge to 100% I left the phone alone for exactly 4 hours and it dropped to 99 %. This was with the following settings turned ON:
WiFi, screen rotation, mobile data, powersave, sync
Network signal 2 bars
Ironically, earlier I had noticed what seemed like heavier than normal drain and after running OS Monitor realized Android Central app was constantly chugging at around 2-5% CPU regardless of settings. The only way I could stop it was to kill the process. Uninstalled.