The OP's experience doesn't match mine but I got the impression early on that Apple -> Sleep before closing the lid is perhaps a little more reliable (nothing scientific though). In terms of Chrome energy performance, between 23:00 last night, and 09:30 this morning, I gave my base MacBook Air its first test:
- Cisco AnyConnect (Rosetta) connected to the office.
- Excel and Word (both Rosetta) running.
- Safari + Chrome (with Chrome running a SwitchyOmega proxy manager and also a Skype web session).
- Microsoft Teams (Rosetta).
- Multiple terminal windows and multi hop tunnels to various systems on site.
- Brightness set to Auto.
- A few tabs open on each of Safari and Chrome.
And we were busy - the screen didn't get time to turn itself off once. Result? 23:00, 92% battery remaining. 09:30, 32% battery remaining.
My thinking at this point? If you hare having performance problems around battery life, and nothing in Activity Monitor explains this, then perhaps you should be having a conversation with Apple (or sending the laptop back if your local consumer rights allow this).