Is this converter accurate?

Conversions use exact defined factors where they exist (for example 1 inch = 2.54 cm exactly) and results are shown to 8 significant digits.

Why does a higher L/100 km mean worse mileage?

L/100 km measures fuel consumed, so it is the inverse of km/L or mpg, which measure distance per unit of fuel.

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Convert between km/L, L/100 km and miles per gallon.