MPG vs km/L: Conversion & Differences
Both MPG and km/L measure distance per unit of fuel. Converting between them requires accounting for the exact ratio between miles and kilometers, and gallons and liters.
Multiply US MPG by 0.425144 to obtain km/L. Multiply km/L by 2.352146 to obtain US MPG.
Why Both Units Share the Same Mental Model
Unlike L/100km (which is an inverted scale where smaller numbers are more efficient), both MPG and km/L are direct efficiency metrics: the larger the number, the further your vehicle travels on one unit of fuel.
km/L is prevalent in Japan, India, Brazil, and parts of Southeast Asia, whereas MPG is used primarily in the United States and the United Kingdom.
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