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45W is likely plenty for almost any use.

I have the 16" M1 Pro MacBook Pro and regularly run it from a small 30W USB-C PD charger. That keeps up with the demand even running Photoshop, Minecraft, Xcode, etc.

I do the same thing with my 2018 Intel MBP. It's nice being able to go on trips with only your phone charger.

You can choose from either at no additional charge.

This is surprising! Thought they would have found a way to extract more money from people.

I charged my 2019 16" MBP on a 29W brick from a M1. Charges fine over (a long) time. I bet my laptop runs hotter than this new MBA.

I had one of the last intel mbas and whatever charger they shipped with that computer was downright anemic. 29W maybe then if that's what yours was? I put the computer under load with a game and the charge actually was trickling down with the thing plugged in and the cpu throttling.