In America we say the fuel economy of car as miles/gallon (miles per gallon). I know in some countries people use Liter/100 km (liter per 100 km). Some countries use km/Liter (km per liter).

Which format do Japanese people use, L/100 km or km/L?


We use kilometers per liter only.

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That would be km/L (only).

(source: 車ラボ.com)

Fuel efficiency is called 燃費 and "fuel efficient" or "fuel inefficient" are called 燃費がいい or 燃費が悪い.

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