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interesting, thanks for the reply.
I think I've seen a gallon of propane as having between 90,000 to 95,000 btus. My boiler runs 80-85% efficient and electric resistance heat is pretty much 100% efficient at 3412 btus per kilowatt hour.
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Best tank= 81.23 mpg on 07-01-2008
Longest range= 791 miles on 9.74 gallons
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