Fuel Economy Unit Converter
Convert fuel economy between US miles per gallon, UK miles per gallon, litres per 100 km and kilometres per litre. A US gallon is 3.785411784 L, a UK gallon 4.54609 L.
Frequently asked questions
Why are US and UK mpg different?
The gallons differ. A US gallon is 3.785411784 L and a UK (imperial) gallon is 4.54609 L, so the same car shows a higher UK mpg figure.
Why does L/100 km go down when mpg goes up?
They measure opposite things: mpg is distance per fuel, L/100 km is fuel per distance. The converter inverts them, using 1 mile = 1.609344 km.