This fuel efficiency converter switches between miles per gallon (MPG) and litres per 100 km, so you can compare cars and understand fuel ratings from anywhere in the world.
MPG measures distance per unit of fuel — higher is better. L/100km measures fuel used per distance — lower is better. To convert, use L/100km = 235.215 ÷ MPG (US). So 30 US MPG ≈ 7.8 L/100km.
Note that UK (imperial) gallons are larger than US gallons, so UK MPG figures differ from US ones for the same car.
Divide 235.215 by the US MPG figure. For example, 40 MPG ≈ 5.9 L/100km.
Higher MPG is better, but lower L/100km is better — they move in opposite directions.
No. A UK gallon is about 20% larger than a US gallon, so UK MPG figures look higher for the same real-world efficiency.
Results are provided for general information. Double-check important figures independently.