Audisal

So I just got my new Audi etron gt saloon version after I had the Etron launch edition 55 quattro and at first glance its a stunning car and visually looks amazing, however that being said when I compare it to my launch edition Audi Etron the interior is way more inferior in terms of the accessories inside the car and the systems that they had inserted in , the most annoying thing I find is that the mileage haven't changed much, you still get pretty much the same miles with the GT as with the older version, maybe I am not comparing the right cars but I thought "upgrading" to the GT will actually feel like an upgrade but I actually thinks the launch edition is way more superior and I was wondering if it was only me or is there more people like me out there, also on a side note, if you own an etron GT why cant I change it to S mode when I drive, is this an extra option that needs to be purchased and only available in the RS version or is there a way to do it and I just dont figure it out.