I had some of the same questions at the beginning of this past weekend. We took our n2u HTT out for our maiden voyage and the weather was 29* at the low end and 55* on the high. We have one pop-out and it is not covered by PUG or solar blanket.
I was very curious to see how much propane the furnace would consume. I had two creamic disk heaters with us for a safety net just in case the furnace ate fuel at a crazy rate and ran us out. I was also unsure exactly how much propane the tanks contained, although the previous owner said they were full. I did not have then filled.
The furnace ran off and on for most of the trip. The only time we shut it off completely was for a three hour period when we were away from the camper on Saturday. At the coldest point during the weekend, Sunday morning ~ 29*F, the furnace ran almost constantly (keep in mind that I have little kids who do not tolerate cold as well as my wife and I). We did not use the ceramic disc heaters.
The long and the short of it is that we ran the furnace hard all weekend, cooked a couple meals on the indoor stove, powered the fridge one hour each direction while in transit, and ultimately used less than a standard 20lb tank of gas. I was worried that the firnace might use a tank all by itself but not so.
I hope this helps.
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