Although our temps are not as cold we have used 8 gal in the past 21 days. ($25)
Temps low in 40's, highs in the 60's.
There is a major problem with yours somewhere like a propane leak but I would think you would be able to smell it. Check your ridgid pipe that runs under the rig, soap up the fittings and check for leaks.
Propane is heavier than air, so an outside leak would drift to the ground and would not be detected standing upright.
Hope this helps but it could be a bunch of other things also.
Bob
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