Best is to export your HD timeline to mpeg2-dvd from Premiere and import the two files (m2v+wav) into Encore. A 1.5 hour timeline will fit nicely on a DVD.
No retranscoding needed. Make menu and burn.
If you export to mp4 first and load that into Encore your file gets re-encoded something you do not want.
The same goes for BluRay: export to H.264 BluRay import that into Encore, build menu and burn. No re-transcoding.
Beware Premiere 7.1 has a bug in the H.264 BD preset. Encore does not see the files as BD compliant.
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