Pianotuna wrote:
My propane runs out in 72 hours in -30 weather. Tank is 60 pounds.
Don,
My propane tank is 18 gallons empty - so it holds in the vicinity of 60-70 pounds when full.
Since the interior volume of our 24 footer is less than your situation ... while I also haven't gone to the cold weather extreme preparations that you have ... I could probably get around the same 72 hours on our tank using only propane furnace heating.
However, if I was to supplement the propane furnace with some long generator runs with electric heaters during cold weather drycamping, we could probably go many more than 72 hours staying nice and cozy in extreme cold weather. Our Onan was fairly well installed by Winnebago, so it's noise level and vibration levels in the interior are quite tolerable doing long runs of it.