[Greenbuilding] woodstove efficiency: ashes/dryweight?

[Reuben Deumling]

I'm curious if the amount of ashes generated over a season permits one to
say anything about the efficiency of combustion? I get about 2 lbs of ashes
for every 100 lbs of (Oak & Cherry & Fir) firewood (dry weight). I have no
idea if this is a lot or a little. Or maybe there is absolutely no
correlation? But I suspect someone on this list (Norbert?) might have
thoughts on the subject.

Thanks.

Reuben