Textures sizes Web/PC vs iOS.

Hi,
Im working on iPad app and Ive noticed that after switching platform from web/pc to iOS Textures memory in stats increased about 4 times. Is it any explanation of this?

Unity editor quality is set to same level and texture size to full resolution.

Thanks for help

Hmm, could it have something to do with mipmaps? could it be that it reimported the textures and turned Mipmaps on by default? Also, I think IOS only allows PVRTC compression while PC/Mac allow others.