In reply to:


Incidentally, does anyone know the reason for having two different gallon capacities (US & Imperial)?



Its got something to do with the weight of a barrel of water (or oil), which held "44 gallons".

the weight of a 44 gallon barrel is lower in the US, and this is factored backwards to produce a gallon with less than the Imperial gallon.

Probably goes right back to Rockerfellers time, and he or his ilk probably used the lighter barrels to sell less oil in the same "size" container as his competitors, thus inflating his profits.