Hi all, I just got a maxed out 13" rMBP. So far I'm very happy with it except I'm a little unsure about it's battery. Many people say they can get about 11 hours off it and even up to 12 on normal use (Apple promises 10). Generally though my percentage is calculated a little below what I think it should be. Oftentimes after a full charge it will say I have an estimated 8 or 9 hours left. I realize that's still a good battery life, but it was an expensive computer and I'd like to make sure it performs to it's full potential. Do your percentage estimates generally fit with how much time Apple says your computer should last?