What about battery life?

on mbp 13" (early 2011) used have 6-7 hour battery life snow leopard, switched lion , reduced 4-5 hours, how mountain lion? provide better battery life lion?

 

my battery life on 2011 17" mbp around 6:00-6:30.

when switched on lion, reduced 3-4 hours, installed gfxstatus , had machine set "indiscrete graphics" bumped normal battery hours.

 

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