Hy, I have just installed Mavericks GM on my Macbook Air 2013 and I am experiencing some battery issues. It was a clean install, not an upgrade. I heard a lot of people asking about the 2013 MBA with mavericks regarding battery life, but honestly it doesn't seem an improvement atm. Right now my laptop is fully charged and it shows about 8 hours of battery life remaining. That is very weird, since it used to show 12 hours on Mountain Lion. I was expecting a big (not huge) improvement with the timer coalescing feature and am now a bit disappointed. I will perform a reinstall soon to check if the issues stick, but still, i find it very weird. Anybody else having this issue?