You do realize that shutting down and restarting the Macbook every single time uses more power than just closing the lid and letting it sleep?
Edit: I'm not saying you are wrong or anything, it could still very much be a problem with the OS update. I'm just stating that battery life might improve if you don't shut everything down every time.
Edit: I'm not saying you are wrong or anything, it could still very much be a problem with the OS update. I'm just stating that battery life might improve if you don't shut everything down every time.