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Fuel Efficiency Converter

Convert between km/L, US mpg, UK mpg and L/100 km — including the inverse L/100 km scale used in Europe.

How to use

  1. 1Enter a fuel economy figure and its unit.
  2. 2Choose the unit to convert to.

How it's calculated

Converts through km per liter. L/100 km is inverse: km/L = 100 ÷ (L/100 km). 1 US mpg = 0.4251 km/L; 1 UK mpg = 0.3540 km/L.

Frequently asked questions

Why is L/100 km 'backwards'?

It measures fuel used over a distance, so lower is better. mpg and km/L measure distance per fuel, so higher is better.

How do I turn L/100 km into US mpg?

Divide 235.215 by the L/100 km figure. 8 L/100 km ≈ 29.4 US mpg.

Why do UK and US mpg differ?

A UK gallon is about 20% bigger than a US gallon, so the same car shows a higher mpg in the UK.