[shadowfaxRodeo]

I've tried it out, I'm still getting smaller AVIF files with dithering. Not like the saving you get by using a dithered png instead of a jpeg.

Depends on a lot of factors. You can keep turning the quality down on avif and get it lower than a dithered image. At some point I'd prefer the crispness of a dithered image over a blurry full color image.

Also, avif seems to do a really good job of lossy compression on dithered images.