[are595]

In my own tests, I found FLIF generally beats PNG (PNG Crush/Optipng both in brute-force mode) for comics (greyscale, majority white) as well, but by a less significant margin.

It's also worth noting that there aren't many other lossless formats, so it's still a valid comparison. I'm sure neither TIFF nor RAW outperform FLIF either.

[rleigh]

That's not a valid comparison for TIFF. TIFF is a container which supports multiple compression algorithms. You could plug FLIF in as a compression algorithm and use it directly.

[are595]

Alright, well against current commonly supported TIFF compression algorithms such as LZW, Packbits, and ZIP.