Does anyone know if there is a noticeable battery life difference between these processors? I currently have a 15" 2.9GHZ (i7 6920) and my battery life is garbage. I'm at 85% now and it's estimating 4.5 hours of usage remaining...and all I'm currently doing is light browser usage in Safari. Would the 2.6 or 2.7 have improved battery life and have reduced heat? Edit - According to Activity Monitor, I'm using integrated graphics as well.