Fuel Economy Converter

MPG ↔ L/100km ↔ km/L — the tricky triangle, solved. Convert fuel economy between MPG (US), MPG (imperial), L/100km and km/L instantly. Free fuel consumption converter that handles the inverse relationship correctly.

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Über Fuel Economy Converter

Fuel economy hides a trap: mpg and L/100km are inversely related — better mileage is a bigger mpg but a smaller L/100km number. This converter does the non-linear maths correctly for US mpg, imperial mpg (used in the UK), litres per 100 km and km per litre, from a single input. Perfect for comparing a European car's 5.2 L/100km rating with an American 45 mpg figure.

So verwenden Sie Fuel Economy Converter

  1. Enter your fuel economy figure.
  2. Choose the unit it is quoted in.
  3. Read all other units instantly.
  4. Remember: lower L/100km is better.

Wichtigste Funktionen

Why are mpg and L/100km not simple reciprocals?
They are reciprocals after unit conversion: L/100km = 235.215 ÷ mpg(US). The 235.215 constant absorbs the gallon-to-litre and 100 km scaling.
Is UK mpg the same as US mpg?
No — the imperial gallon is about 20% larger, so 40 UK mpg ≈ 33 US mpg for the same fuel use. Always check which gallon a figure uses.

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