Rocket rote:
> "Several of our esteemed adventurers keep the lid up but with a heat
> isolating membrane over the upstairs to keep a modicum of the expensive
> hot air (we see a lot of that around these days) in the cabin."

Well, I think I made the first "fleece thermal barrier" a few years
back.  Version two:
http://jones.colorado.edu/VW/FleeceBarrier

Such a slight layer makes a HUGE difference in the effectiveness of
the Propex.  I wouldn't think of NOT using it if I thought I'd kick
on the Propex in the morning.  I sleep in a warm bag and only turn
on the furnace a while before getting up in the morning.

Of course I don't use the fleece barrier if I have grandsons sleeping
upstairs....  ;-)

And just believe Karl's numbers on Propex propane use.  I wondered
last year if my tank would ever empty running the Propex and the
stove.  Feeling how little heat comes out the Propex exhaust indicates
how efficient it is.

Richard