I'm noticing the same as well with my retina actually. The power drain differences are significant enough for me to swap back to safari. I was getting ~7 hour

I'm noticing the same as well with my retina actually. The power drain differences are significant enough for me to swap back to safari. I was getting ~7 hoursish (hard to tell I tend to compile/browse/etc) before and now it looks more like 5. Which is disappointing to be honest. Though using non "best for retina" seems to kick in the discreet gpu more often now.