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Yep, we mix them up. Distance and speed in miles, fuel priced in pounds per litre.
And fuel economy in miles per gallon!
Driving distances in miles, walking distances in kilometers!
And, though admittedly not really exposed much to the public, canals and railways both manage to mix chains in there, too... agh!
And thinking about the height of mountains in meters even though the reason for walking up them is because they reach a certain height in feet.