Don't get me started on the whole imperial gallon vs US gallon thing. The imperial gallon is larger than the US gallon (by a factor of 1.20095). This already makes things unnecessarily confusing when talking to UK friends about gas prices or vehicle fuel efficiency, but it gets even worse, because there are smaller units in both systems. You would think these would scale accordingly, so the imperial quart and pint and fluid ounce would also be larger. But for whatever reason the imperial system uses 20 fluid ounces per pint as opposed to the US's 16, meaning there are 160 imperial fluid ounces in an imperial gallon instead of 128, so the imperial fluid ounce is actually smaller
I would marvel at how this might mess with things like liquor measurements for mixed drinks, but apparently there's basically nothing close to an international standard on shot sizes, so that seems to be a lost cause for world-traveling drinkers from the get go
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