Hi guys, would like to see what's the average battery life u guys are hitting from a single charge? I'm using iris pro as the normal gpu (forcing it using software), but I'm not able to hit pass 6.5 hrs on a single charge. Is this normal? The only time I got a 8 hr battery life was when I first got the macbook from apple. Subsequent charges seems to lessen the battery life. Would like to see some feedbacks from fellow macbook owners. Thanks!