I 1992-95 Civic sedan had a Cd of .32 , while the hatch had a .31.
The next years model hunchback had the Cd jump all the way up to .36 - the same as the Focus hunchback.
The focus and this hunchback both have a shorter roofline than previous, but surely not enough to add this much drag !!
Perhaps it is due to the rounded off taillights .
Speculating , I would guess that there are some mean vortexes forming here, but then why wouldn't the cars simply have a trip strip of some sort here ??
I'm puzzled too !