With all due respect you're full of shit. Just scroll through these comments.

https://www.reddit.com/r/GrapheneOS/comments/10bxsg7/graphene_os_and_battery_life/

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Sounds like it’s maybe Google Play Store sandbox that’s the issue? I don’t use that. That’s not enough to draw any conclusions but maybe a variable to consider.

I mean, that's the main reason I use GrapheneOS over Lineage or /e/. Don't get me wrong it's still worth it. I love that I can occasionally run Google services and not be other times. But it clearly destroys battery.