*"For reference, this past year I’ve been charged $4.90/gal and $1.15/lb at two different local places to refill 20 and 30 lb portable tanks."*
That is like quoting the cost of electricity based on what it costs at a DC fast charger. Has more to do with delivery costs to move it into your tank than it has to do with the cost of propane which is like sub $2 a gal in MN right now.
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