» Sat May 19, 2012 12:00 am
I think the jury is still out on what exactly contributes to save file size. Some say it's down to the most minute detail, like even leaving doors open or axes swinging. Most people reaching those sizes are on xbox and PC, I've only seen a few instances of that size on PS3 (including a bizarre 4-hour, level 2 case earlier today).
I don't think anyone could tell you for sure at this time, but I doubt the main quest will contribute another 7mb. my guess would be you did most of the file size damage already, with the exploration, etc.