If they are selling it a $1 under the cost of gas that is where they are making the money. You will use more per hr than gas (about 20% more). During the summer propane can be bought anyday under $2/gal normally $1.69 to $1.89. If gas is $4/gal they are making a extra $1.10 at least per gallon over their normal mark up. Also at that point you are basically breaking even if you account for the additional consumption.
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