I'm not too interested in quality. Lets say, 2 channel nothing flash. When encoding in spruceup using elementary streams, from the point of view of DVD space taken up, which is the most economical format.

I ask because I had a movie I'd separated the streams on and I'd left the audio as .wav. Its was a low(ish) quality video and the the video and audio took up 66%. When I encoded the audio in besweet to an .ac3 and pulled that in it took up 48%.

Are there any other options that would save even more space?