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Buy a extra tank.
and if you have gas pipe at home, and while they are expensive, a compressor for natgas.
Not the same as a air compressor (non-sparking/non-Ferris).
Economy may be found if not pumping to a full 3000psi but 1500psi.
That would lower the price of the compressor.
Something to explore for economy in your local.
But it may surprise you what it costs to run one of those compressors in electric.
Weigh your options.
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