U.S. gallons are different from imperial gallons. 1 Imperial gallon is equal to 4.54609188 litres and 1 US gallon is equal to 3.78541178 litres. Liters on the other hand are the same everywhere. One liter equals 0.26 U.S. gallon or 0.219 Imperial gallon.
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1 US gallon = 3.7854 liters (rounded)
regardless of what's in the gallon.
Even if it's empty.