MacBook Air M2 2022- Is it a waste to charge with 140W USB-C Power Adapter ?

Hi,

The 67 watt charger will give you the same fast charge as the 96 or 140 watt, so there is no need for using either the 96 or 140 watt, but you can if you want to, it just isn't going to charge any faster.

The only advantage would be if you are using a USB-C power passthrough dock and you have a lot of power hungry bus powered devices connected to it as it steals power from the wall supply for its own needs and its peripherals.

Thank you so much. I've been trying to figure this out. I charge my iPad & iPhone through my MBA, so was wondering if it could "pass through" the excess power of a larger charging block.

Thanks again!

You're welcome.

Correct.