So oil right now is $2.99 a gallon, the best price I see here for propane is $2.33.
So for oil, 138,500 btus/gallon which works out to $25.40 per million btus from a heater with 85% efficiency.
For propane, 91,333 btus/gallon, which works out to $26.30 per million btus from a heater with 97% efficiency.
I'm sticking with oil....
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