how to author a high quality DVD to fit on one disc

Hi all -

I am editing sports events into DVD, with sweeps, lower thirds,titles, credits.

I want to export the highest quality settings I can that will fit onto a single DVD - the same way I would for a retail DVD.
Using Adobe Premiere CS4
If I choose MPEG2-DVD, and set the quality to the maximum (5)
NTSC

29.97 drop frame upper, VBR 1
Bitrate settings: 80,80, 80

The expected output size is 137,825 Mb or 13 Gb

How do the pros export such high quality to a single DVD?

Suggestions highly appreciated - thanks in advance