In a lengthy detailed review of OS Mavericks, John Siracusa of Ars Technica conducted battery benchmark tests to measure the OS’ power saving features on both a 2007 MacBook Pro and a 2013 13.3-inch MacBook Air. While both systems saw notable battery gains from Mountain Lion to Mavericks, the 2013 MacBook Air in particular saw a rather impressive improvement of up to 30%, lasting for more than 15 hours in some instances.

Siracusa’s battery tests were conducted using OS X 10.8.5 and the GM build of Mavericks. He created a light web browsing and text-editing