1 US gallon = 3.8 liters.
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3.785 liters in a gallon
1 gallon is roughly equal to 4.5 litres.
192000 times as much as in a single gallon. The gallon used in the USA has 3.785 liters.
There are several different usages of the gallon. The US gallon is about 3.785 liters, so the difference between 3 liters and 1 US gallon is about 0.785 liters. The UK (Imperial) gallon is about 4.543 liters, so the difference between 3 liters and 1 UK gallon is about 1.543 liters.
21.1 gallons