So I think I can confirm that "'E' St NW" is now pronounced "ee street northwest."* Unfortunately, I tested E St and I'm finding it really difficult to hear the difference between "ee" and "east." I'll try 'N' now.
* Oddly, when I route to a destination on "'E' St NW" my phone then has a sound file "ee street en double you Washington." I don't recall actually having heard "en double you" when reaching my destination. I wonder why this file is there.

