Thanks Ronnie....that's a good way to view.

just to confirm....From Ludwig to the right (5 users) are all with MP3 = ON.

A few thoughts/observations:-

Ludwig may have a lot of classical which I guess may compress well as both FLAC and MP3. Could explain why his Album per TB is highest of the MP3=ON group.

2500-3000 albums per TB is a pretty good guide range for MP3 = OFF.

FWIW I have quite a few CD Singles in there which will bring my average album size down and push my album per TB up.

Can Ratbert, Tintin and ChrisLayer double check that MP3 transcode is switched off (you don't have to have set an export location for this to have created the MP3's). These figures look like the MP3=ON group.
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Would be good to be 100% sure.

Rgds,
Nick