1 gallon (gal) = 3.785411784
litres (L) = 231 cubic inches = 4 qt = 128 fl gal
U.S. liquid gallon is defined as 231 cubic inches and is equal to
3.785411784 litres or about 0.13368 cubic feet. A liter) is defined
as one cubic decimetre (1 L = 1 cubic dm). Hence 1 L = 0.001 cubic
m. The word "litre" came from an older French unit, the
litron, the name came from Leek via Latin. The metric system used
litre as a volume unit.