make sure you have a safari extension like wipr ($1.99) or ka-block (free). I use wipr. only $1.99 so I'll take it since they update the blocklist twice weekly and block any crypto mining malware.
edit: hats off to those that are uploading additional battery usage details PER APP. goes a long way.
* macrumors website runs hot, so I suggest using an adblocker (again, use the safari extension, which is new for ios 15, not an actual app like 1blocker). Once I installed it the heat dissipated
* disable location-based settings in privacy settings menu below
* disable "hey siri" as its enabled by default. would definitely turn that off
* dark mode (obvious) but I'm seeing a good number of folks not using this option
* disable background refresh for selected apps or entirely
View attachment 1857629
* use this highly touted guide to maximize battery life as well