How do I also sync the web calendar feeds that are in my Gmail/Google calendar into iOS 6?
How do you sync Google calendar on your iPhone? Is it a CalDav account or Exchange? 

I've got several calendars on Google which sync without any problems using Google's exchange server. But I'm not sure if it also works with CalDav. See this page on how to set up Google exchange on your iPhone: http://support.google.com/mail/bin/answer.py?hl=en&amp;answer=138740