Firefox burns through battery rapidly too. Seems that you have to stick with Safari to get good battery life out of an MBP - it makes a very real difference
I switched to Safari when it added favicons to browser tabs the other month. The CPU-usage/battery difference is huge. I also like the new Safari extension paradigm and have ported some extensions of my own that could be improved by moving CPU-bound work to Swift.
I have Chrome only for the built in Flash. I don’t play many flash games these days, but I don’t know what I’m going to do when Google finally strips that out. Seems like Kongregate has drifted towards Unity but there are a few classics, and I have an old game that a friend and I made a long time ago that I like to play from time to time.