furlongs are an eighth of a mile
pints are half a quart, which is a quarter of a gallon
therefore, "furlongs per pint" is equivalent to "miles per gallon". you can just substitute it

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furlongs are an eighth of a mile
pints are half a quart, which is a quarter of a gallon
therefore, "furlongs per pint" is equivalent to "miles per gallon". you can just substitute it
it's worse, though, because British pints and American pints are different sizes!
so are british and american gallons