There is definately some confusion and conflicting information about the GFX package. Please read as follows, as clarified by Mazda Directly....
The Mazda3 GT has a GFX option, however the Mazda3 Sport does not have an
additional cost for GFX but the features of the GFX are included in the
pricing. It is possible that there is some confusion as to whether you were
inquiring about the Mazda3 GT with GFX (sedan) or the Mazda3 Sport.
There! That should clear up some misunderstandings.
H. Hawk