doxiemom11 wrote:
You may want to consider purchasing some type of electric heater to subsidize the furnace or just take the chill off when needed. Many campgrounds include electric in their nightly rate and would reduce the cost of propane. We wintered on the gulf coast at a park that includes electric. Total propane expense for Oct - Apr was $49.00. Your budget may be close for what you are doing ( 120 day trip) but is much much more than we would spend in 120 days.
While this is one way to avoid higher propane costs, you may end up spending much more on repairs to frozen pipes that would not be heated via the electric heater option mentioned above...just a thought.