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I don't think it has anything to do with money.
It's just a part of your national schizophrenia pride.
On one side you're the most inventive people on the earth, there's no coincidence industrialisation started in the UK.
But at the same time you can be extremely averse to anything "not invented here", and having a non functional management culture, which together explains the death of the British car industry (and brexit, but let's not go there ).
Coming from imperial usage in the dark ages, there are a number of these inconsistencies where both can be used. Particularly for us old farts.
e.g. Tyre pressures is still more commonly defined in psi rather than bars.
A Fine is a Tax for doing something wrong
A Tax is a Fine for doing something good.
For the "fuel consumption per distance"-measure there is no direct equivalent (in the sense of being somehow related to kilometers) in Dutch. We use "verbruik" which means 'usage' but with the specific connotation that it's a consuming type of usage (the related word "gebruik" is the normal not-necessarily-consuming type of usage).
The word for "what the odometer measures" is kilometerstand.
Since when did US folks start getting concerned about mileage? The last time I went there about nine years ago, nobody spoke about mileage, and they said that only people in lesser countries bothered about mileage.