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My wife and I take our boat out locally as often as time and weather conditions allow, but that probably amounts to no more than 25 outings (100 tank fills) per year.
Just out of curiosity I recently looked into the purchase of a small compressor. The cheapest ones I could find run about $3,500 new. Assuming a savings of $5.00 per fill and 100 fills per year, it would take 7 years to pay off the investment.
Operating costs (filters, electricity and maintenance) would make the ROI even worse, but could be partially offset by fuel savings from not having to drive to the LDS for tank fills.
Bottom line is, unless I was going to be filling more than 200-300 tanks per year, buying my own compressor doesn't really pencil out.
This has nothing to do with being cost-effective. A small inexpensive compressor that I have to run and maintain is probably the least-efficient tank filling method possible. My post was in response to someone who was questioning where I could get fills if the LDS closed.
Terry