1 year of battery stats for 2012 MBA
Interesting. Someone ran a script for 1 year on his MBA to evaluate the depletion of the battery's capacity: The (De-)evolution of My Laptop Battery
Compared to his previous 2009 MBP (see article), the MBA's battery capacity falls faster. Some speculate the heat and the smaller enclosure of the MBA might have something to do with it. But still, 85% of the battery's capacity remains after 1 year of normal usage.