> Of course you are you simply don't realise it. Don’t be ridiculous. Of course I know that the customary units are formally defined in terms of metric. I also

> Of course you are you simply don't realise it. Don’t be ridiculous. Of course I know that the customary units are formally defined in terms of metric. I also know my milk jug, like all gallon milk jugs in America, says “3.76 L” next to “1 gal” on the label. But if I ask someone—anyone—in my family or my workplace to pick up three liters of milk, they won’t have any idea what I mean. If that’s your idea of a culture that “uses” the metric system, you have a very strange definition of the word “use.”