@NeverDie
Hi, I know this is an old thread, but it is stil a valid subject to me.
I have had success with arduino pro mini v2 and RFM69W in sleep, but not the high power version RFM69HW.
Arduino+RFM69W sleeps at 5.2micro Amp.
Arduino+RFM69HW sleeps at 420micro Amp.
I have written about it in arduino forum.
I would be glad if someone has a solution for this.

@mar.conte
Hi, I'm in the same boat to.
My RFM69HW(high power) + Arduino sleeps at 450uA.
But RFM69W(low power) + Arduino sleeps at 5.6uA.
My Arduino pro mini v2 alone, sleeps at 4.5uA.(info here)
I have searched high and low for reported sleep current on RFM69HW, but none have come up. This is very sad, as RFM69HW is king on range.
My same topic here.
Please leave a note if you or anybody else find a solution to this.
-peres