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I US Gallon = 3.7854118 liters

So 21 miles per gallon = 21 per 3.7854118 liters

1 mile = 1.609344 kilometers

So, 21 miles = 33.796224 kilometers

33.796224 kilometers per 3.7854118 liters = 8.928017818299187 kilometers per liter

.... call it 8.93

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1 Imperial Gallon = 4.54609 liters

So, 21 miles per gallon = 21 miles per 4.54609 liters

21 miles = 33.796224 kilometers

So 1 mile = 1.609344 kilometers

So, 33.796224 kilometers per 4.54609 = 7.43413008862759 kilometers per liter

.... call it 7.43

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14y ago

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