There aren't points in a gallon in the usual sense of units for measurement.
The most common units used for gallons are:
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Quarts: There are 4 quarts in one gallon [US customary units].
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Pints: There are 8 pints in one gallon [US customary units].
It's possible you might be referring to a specific point system not related to measurement. If you could clarify what you mean by "points" and gallons, I might be able to provide a more specific answer.