Dick, that's why body temperatures, in degrees Celsius, are routinely given to the first decimal place; that wasn't commonly done (in my experience) when using degrees Fahrenheit. The practice effectively (but marginally) increased the precision, although the accuracy of the instrumentation was usually the major limitation.
And maritime and aeronautical personnel still use nautical miles and knots among themselves but, when dealing with the press and others, have to translate those values into km and kph for us lesser mortals. Those lesser mortals in places that still use statute miles and derived mph may not be as accurately informed as they presume, if the values given are not converted from the nautical to the statute versions.
I seem to recall NASA had a bit of a cockup with one of its missions to Mars because of similar assumptions.