Ars Technica’s John Siracusa did an extensive review of OS X Mavericks. Amongst other things, he benchmarked battery life on Macs with the new OS X installed. The results are pretty impressive to say the least.
He tested battery life on both a 2013 13-inch MacBook Air and 2007 MacBook Pro. Both systems saw noteworthy battery gains when the computers were updated from Mountain Lion to Mavericks.
As you can see from the results above even the six-year-old MacBook Pro saw a solid increase in battery life, while the 2013 13-inch MacBook Air saw an impressive improvements of about 30 percent, extending its battery life to over 15.5 hours.
John Siracusa indicates:
These tests may or may not be representative of how you use your Mac, but regardless, it’s clear that Apple’s efforts have not been in vain. Mavericks really does consume less energy than Mountain Lion when performing the same tasks.