Not xkcd in this case

https://www.commitstrip.com/en/2016/08/25/a-very-comprehensive-and-precise-spec/

You can even hook up tachiyomi to your home stuff through something like komga as another source

I let syncing run in the background all the time, the app has a ton of settings to configure when it runs so it respects battery/data usage

Android reports the app has used less than 1% of my battery in the last 19 hours