macbook air battery

Hi all, Since last november I have a macbook air 11 inch. I've bought it new. What i notice is that I am not having the most battery as expected. Offcourse I know that battery performance relys on a lot of things such as application usidge, number of USB/tunderbold devices connected en wither or not using wireless or bluetooth. Do you applevis readers have recommendations for the battery to perform to the best? Are their spesefic settings related to voiceover that I sould swich on or of? Also I would like to know tips in general.