0.729 kg of fuel = 1 liter
1 kg of fuel = 1/0.729 liter = 1.372 liter
3.785 liter = 1 gallon
1.372 liter = 1.372/3.785 gallon = 0.362 gallon
Therefore, 1 kg of fuel = 0.362 gallon
1.609 km = 1 mile
7.9 km = 7.9/1.609 miles = 4.91 miles
Therefore, Fuel Efficiency = 4.91 miles/0.362 gallon
Fuel Efficiency = 13.56 miles/gallon
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