Macbook air energy usage - battery runs down whilst sleeping

I have a July 2013 Macbook Air and the battery seems to be running down quickly (more so while it is sleeping, the usage when awake seems to go down at expected rate).
I have taken it to apple genius bar who said the battery was fine and did a fresh install of 10.9.2 (I then restored my time machine backup). They ran a diagnostic and said battery was fine.
There are no big active processes under activity monitor and power nap functionalies are disabled.
The battery runs down over the course of one day if asleep and just now it dropped by 10% in an hour while asleep (closing the lid or going to apple and then sleep makes no difference).
It did seem to start suspicously around the time I upgraded to Mavericks so I feel it's a software issue....
Any ideas?!
Thanks so much
Alexis

Tami ...
  I turned off any automatic updating, stopped Sophos Antivirus from on-demand scanning.  
Regardless of turning off updating .....   a/v software on Mac can cause a litany of problems.
Uninstall the Sophos a/v software >  Removing Sophos Anti-Virus for Mac OS
Then restart your Mac to see if it makes a difference.

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