Chilean-American here, absolutely. All the time. I still can barely do fahrenheit, and I've come to prefer the American system of feet and inches for human height.
obviously Firkins / 1,000,000. Unless Firkins aren't in sane decimal universe for grownups but one of those feet-to-inches (or miles-to-yard, or feet to X) magical constant ones
everyone knows Firkins are measured in 7-bits. The thing I never can remember is if it is Big-Endian or Little-Endian. things are either quite big or quite small if you get the wrong endianess