Why is the UK gallon different?

The UK (imperial) gallon is 4.546 L vs the US gallon at 3.785 L. The same car shows a very different MPG number in each system.

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Why is the UK gallon different?: The UK (imperial) gallon is 4.546 L vs the US gallon at 3.785 L. The same car shows a very different MPG number in each system.