If you are just turning on the furnace to warm the MH for a few hours so you can do some work, then fine. I bet leaving on a 1,500 watt ceramic heater 24/7 will also warm it up to a nice level unless it is freezing outside. Oh, I see you are in W Virginia so maybe it is freezing.
A 20,000 btu/hr furnace which would be typical for a MH like yours will use 1.5 lbs per hour or about 3/8 of a gallon per hour.
David
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