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Significance
The question really is how "significant" is that digit???
One-thousanth of a gallon? I don't think the pump is that accurate for one. One-hundreth seems to be sufficient to just round it using common rounding rules.
In addition, all data before such a change would need be considered inferior due to the additional digit.
Personally, the fourth digit is moot.
RH77
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“If we knew what we were doing, it wouldn't be called research” ― Albert Einstein
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