Power saving options

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i need reduce arduino's power footprint as possible (in software preferably).  i wondering if has had experience avr/power.h?  

link here: http://www.nongnu.org/avr-libc/user-manual/group__avr__power.html

does arduino codebase optimization, or turned on?  if i'm not using adc pins, can disable whole unit?  which timers can turn off?  i think timer0 used loop(), other ones?  

any massively appreciated.  

best,
chris

(p.s. http://www.nongnu.org/avr-libc/user-manual/group__avr__sleep.html seems promising well, i'm hoping power.h has lower hanging fruit).  

maybe can experiment , report ! :-)
i don't think current core power optimization.  the peripheral used default timer0 (not ideal power saving point of view; 1 of other timers stays on during 1 of major power-down modes, not timer0.)   other timers used analogout() (pwm)


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