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Fuel Efficiency Converter

Convert fuel efficiency between L/100km, MPG (US), MPG (UK), and km/L.

Fuel efficiency is measured differently around the world. Europe, Australia, and most of Asia use liters per 100 kilometers (L/100km) — where lower is better. The United States uses miles per gallon (MPG US), while the United Kingdom uses imperial MPG (MPG UK), which is about 20% higher due to the larger imperial gallon.

Japan and parts of South America use kilometers per liter (km/L). Converting between these units helps when comparing vehicles from different markets or reading international reviews.

The conversion formulas are: MPG (US) = 235.215 / L per 100km; MPG (UK) = 282.481 / L per 100km; km/L = 100 / L per 100km. Enter any value in L/100km and see all equivalent figures instantly.

Frequently Asked Questions

Why are US and UK MPG different?
A US gallon is 3.785 liters while a UK (imperial) gallon is 4.546 liters. So UK MPG is always about 20% higher than US MPG for the same vehicle.
Is L/100km or MPG better as a metric?
L/100km is more intuitive for comparing costs because fuel use scales linearly. The difference between 10 and 15 MPG saves more fuel than between 30 and 35 MPG.
What is a good fuel efficiency?
Under 6 L/100km (over 39 MPG US) is considered excellent. 6–8 L/100km is good, 8–12 is average, and over 12 is high consumption.
Fuel Efficiency Converter
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