That does seem rather short – most reviews of the 12" Macbook seemed to indicate that 8h was an achievable runtime. I hear that Chrome sucks up battery like no

That does seem rather short – most reviews of the 12" Macbook seemed to indicate that 8h was an achievable runtime. I hear that Chrome sucks up battery like nothing else though; might be worth investigating whether Safari's improved power usage is worth the tradeoff in other aspects?