0
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
------------
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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