Originally posted by: oojason
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Video Bitrate: 5-8 Mbps (average bitrate)
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Not doing any calculations, but I think it would be a struggle to fit video with an average bitrate of above 5000kbps and two soundtracks (commentary + main) onto a single layer DVDR.

Also, stating the average bitrate is somewhere between 5 and 8 Mbps is akin to saying "the running time of this movie is between 80 minutes and 2 hours." It doesn't really impart any useful information.

Information I have states that the average bitrate is around 4340kbps, but I can't remember where this came from.

:: EDIT - That's for ANH, of course ESB and particulaly ROTJ will be lower because they are longer films.