Re: Battery graphs - IMHO, the best way to display is to show both 24hr and 10d, along with the top Apps list. Show long SOT stretches without plug in, and if showing a plug-in, try to screenshot/position it on far left or right so it’s easy subtract out. 10d graph alone misrepresents SOT while plugged-in, and arguably those ‘sticky’ first-percents after unplugging, esp w/ multiple plug-ins that may be hidden by the 10d.
For example, this 24hr shows ~7.5hrs on ~50% batt and my 10d avg is more like ~6.5hrs SOT on batt since I avg ~1hr SOT while plugged-in.
Re: Cellular data - the most efficient is to use the ‘wifi-calling’ feature at home. Major carries provide this free as this saves them money/bandwidth too. This routes your calls and texts over the internet/wifi, and can massively reduce power consumption AND improve voice quality if your cell reception is 1-2bars at home like mine. You can see from my graphs that cellular is airplane mode although batt graphs don’t show the wifi-calling icon in the top left. (Reminds me to write a one-touch shortcut(s) to swap wifi<>cellular when coming/leaving home).
I think another good ‘freebie’ is not letting Apple use your phone as crowdsource AirTag beacon, which could also provide further battery health benefits, but that gets into the controversial charging issue and ‘Apple knows best’ thing.