Builders' super area claims are pure fiction, I've seen it.

Just moved into my EESHANYA INFRA LLP flat in Doddanekkundi last month. Yaar, super area ka calculation toh poora game changer hai. Builders toh bas numbers inflate karte hain, especially for projects near Kanakapura Road. Mera 2BHK 1200 sqft bola tha, but carpet area hardly 850 nikla. Did anyone else face this? Also, yeh floor-rise premium worth it hai kya? My 4th floor flat cost extra, not sure if it was a good call. How much can one actually negotiate on these things? Share your experiences, especially for Bengaluru properties.