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Aero84, you could throw all you data into an excel (or any other spreadsheet program), and have it do the conversion. Can you export the data from your other site, or do you already have it stored somewhere? That way the conversions are done, and all you have to do is enter it in.
You could also add up all the tanks up until the last month or so and enter them as one huge tank, then enter the more recent ones individually.
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