I got 8mA with Nick's power sketch J with the same setup sans coin cell (broke, new holder next week). I think that that the Xbee 3v3 regulator is costing an order of magnitude. There are two leds, but I am sure they only cost 10-15mA. I will investigate if they can be disabled other than scrapping. Considering the LiPo and solar option, I am not sure what we are discussing unless the unit is north/south of 80 degrees.
With an internal clock and no regulator/LEDs, I replicated Nick's sleep tutorial +5% of 0.35uA with a breadboard setup. I have not tried just the watchdog, which this SeeedStudio Stalker is capable of (Interrupt traces cut to enable). I am not sure why the Narcoleptic library does not shut the ADC down.
Properly optimized, the coin cell will die before the LiPo gives out.