Once I have finished editing with Final Cut Pro 5.0.4, I am exporting a quicktime reference to compressor.
I put in all my settings as per usual in compressor (a long piece of footage about 2hours) & then I make sure the file size is around 3GB (on the overview page) as I have some other footage that I need to fit on my DVD-5.
Everything is all good I go to encode then a few hours later (Roughly) it produces my MPEG2 file as a whopping 4.8GB to 5.2GB (I've done it a few times) WTF!!!
I always produce a nice quality MPEG-2 file (2 Pass variable bit rate)