I suspect that might relate to the smaller english/canadian fluid ounce and imports. they're very close, you only start to easily see a difference around 5 ounces. I run a bar in Canada, and i catch inspectors and suppliers constantly playing fast and loose with Imperial and American standards ounces and pints. Canadian law saws if you are serving a pint of beer, it has to be a proper Imperial pint of 20 ounces, from the big English gallon, if you call it a pint. you can serve any size you want if you don't call it a pint. i constantly see competitors passing off 16 American ounces as a pint. The revenue guys check that your dispensing machines are putting out an ounce but won't tell you whether they are using a Imperial or Standard ounce, i'm pretty sure they're using American ounce devices when they shouldn't be. Supposedly we're a metric country but liquor and cattle definitely aint.

The difference of Scotland, Wales, and England matters to you and maybe the French. To people on another continent talking about measurement systems...well,,,I'm aware Scotland has their own passport. If you want me to know you're at at a Scottish gas station, say that. I'm sorry, but Scotland didn't run a giant empire for 200 years, England did. It's kinda funny you live in one of the very few countries the English never conquered and no one cares.