The 'English' system used in the USA isn't even the same as the Imperial system in Britain. If I ordered a pint of beer in a pub and got a US pint, I would complain. A British pint is more than 20% bigger!
"It's curtains for you, Mighty Mouse! This gun is so futuristic that even *I* don't know how it works!" -- from Ralph Bakshi's Mighty Mouse