The technique I've been using lately is to play with the angle a little bit in the flight plan, then go to Progress page 2 and see what rate of descent it's calculating. **Typically** if it is calculating around 3000 fpm you can do a thrust idle max speed descent following the VNAV path.
It's typically been ranging from around 2.5 to 4.5 depending on wind and speed restrictions.
If you're planning on using a thrust idle descent, it's not a bad idea to take a look at the winds down lower on the paperwork, so you don't work yourself into a jam as the wind picks up or drops off.
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