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I asked the people at Nissan and I was told it wasn't possible to switch it to miles-per-litre. Although I do suspect the person I spoke to had no idea what I was going on about.

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But could you change it to km-per-litre?

Litre-per-100km is the European standard.

Dimensionally, that has units of area, and so could be expressed in hectares. My car is getting about 11.5 pico hectares.

The same way that torque has the dimensionality of energy and can be measured in joules.

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