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The most common SI/metric system for fuel efficiency is liters per 100 kilometers. Overall I like the unit more than miles per gallon because it makes planning trips around your fuel consumption a bit easier and doesn't seem to get as skewed out at low and high efficiencies as miles per gallon does. But I still use MPG out of...habit, culture, the speed limits and gas pumps are in miles and gallons...and no one uses gallons per 100 miles!
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