Not really, i´d reduce it around 5 until 10%
-you need disable xiaomi frameworks activity if you dont use MI ACCOUNT, and enable only 3g as data network, disable ram extension( if you has it),
-install magisk and install 5g disabler (if you does´nt it) **MAYBE YOU LOSE DRM L1(to see amazon, netflix in HD)**
-install other kernel as sixteen kernel(it reduce the consuption) i´d recommend it... ***you need install magisk after it, if you have it before install the kernel**
-Check your network speed on fast.com it you see diferences with your service is a miui gift to solve it you need enable bluetooth, movil data, wifi then airplane mode, then bluetooth, after it disable airplane mode, finally disable all except wifi
-disble wifi assistant
-check permission app settings apps thats starts automatically
-disable bluetooth and wifi search
-if you dont use google app as app key logger, assistant disable it
INSTALL OTHER miui port ROM xiaomi eu lite between others
-AOSP ROMS arrow os ALL WORKS (actually i´m in) **IT DON´T HAVE MI BACKUP, SOUND ASSISTANT( I SOLVE IT), SCREEN CAST FEATURES, XIAOMI FRAMEWORKS NOT IN** -MIUI CAMERA INCLUDED