Fuel Economy Converter

This fuel economy converter switches between the four units used worldwide to describe how efficiently a vehicle uses fuel: litres per 100 kilometres (L/100km), miles per gallon using the US gallon (mpg US), miles per gallon using the Imperial gallon (mpg UK), and kilometres per litre (km/L). New Zealand and Australia quote fuel economy in L/100km on official vehicle labels, where a lower number means better efficiency. The United States uses mpg US and a higher number means better. The United Kingdom uses mpg Imperial, which always reads about 20 percent higher than the US equivalent for the same car because the Imperial gallon (4.54609 L) is larger than the US gallon (3.78541 L). Some Asian markets use km/L, which is the direct inverse of L/100km. Because L/100km is an inverse relationship to mpg and km/L, the maths involves dividing a constant rather than multiplying: to convert L/100km to mpg US you divide 235.215 by the L/100km figure, and to get km/L you divide 100 by L/100km. You choose a unit, enter a value, and all three other equivalents update instantly. The tool is useful when comparing an imported vehicle spec sheet against a local fuel economy rating, when reading car reviews from different countries, or when shopping for a vehicle across regional markets. Values are for reference only and actual fuel consumption will vary with driving conditions, load, and vehicle condition.

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