When I try any percentage for the map width the map is not displayed.
I checked in google editor tools and the code is there - just not showing up.
Regardless of the % width I select, the widths in several of the div elements are 100%. I don't see the width I entered anywhere. I temporarily switched to twentytwelve - same thing. Tried unchecking "overflow:hidden" still don't see a thing.
Here's an example - width set to 100%