I am an avid gmail user for my mail, contacts, and calendar. I do not care where my contacts and calendar are really, I am actually wondering which setup would use less battery power. Option 1: Use email, contacts and calendar sync with Google Sync via Exchange Option 2: Use Contacts & Calendar via iCloud and email with Google Sync via exchange. Option 3: Use iCloud for Contacts and Calendar and use traditional gmail imap for email I am trying to maximize battery life on my 4s, I am having fairly rough battery life, and its about on par with what I got on my iPhone 4 with iOS 5 installed. iOS 4 had much better battery life in my opinion.. Thanks for any comments!