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> miles-per-gallon (or litres-per-km) [1].

The UK is metric except for distance and beer.

So the disgusting ‘miles-per-litre’ is presumably needed too.

Also the UK gallon is different from the US gallon. And the same applies to all the other non-metric fluid measurements such as pints and fluid ounces. Historically the UK gallon was used throughout the former British Empire (Australia, Canada, India, Ireland, Malaysia, New Zealand, South Africa, etc). By contrast, almost nobody ever officially used the US gallon except for the US (and a small handful of highly US-influenced countries such as Liberia).

Each standardised on a different gallon. Prior to that, gallons depended on that you were measuring.

One, a beer gallon, the other a wine gallon. The US still also has 'dry gallons' for things like pints of blueberries.

Meaning the ideal (cursed) unit of fuel consumption has units of 1/m^2

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