Line 3 was to check that it wasn’t a “mistake” but line 5 proved that it was a “mistake”. It stinks bad.
Not a strange spelling, a mistake. Did you know that there is even an Oxford Dictionary of American English. Whatever next? They can be forgiven for having smaller gallons than an avoirdupois one but to be one of only 3 countries who have not adopted the SI system, the other two being Liberia and Myanmar, they really are a backward nation in some respects.
#1474 3/6 As observed by @Billywiztheelder , ther is English and then there are mistakes... American English... I beg yours? As for 'customary units', heathen I tell you, heathen.