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Keep in mind that the error is proportional to how much you put in the tank. In other words, an error of +/- 0.5 gallons will be 5% if you're putting in 10 gallons, as compared to 10% if you only need 5 gallons to fill it.
Temperature seems to make a notable difference, too. I try to fill at the same time (preferably when it's cool outside) so that doesn't make so much difference.
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