Fuel Economy Converter
Convert between MPG, L/100km, and km/L
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Note: US and UK gallons differ in size. A US gallon is 3.785 liters while a UK (imperial) gallon is 4.546 liters. MPG and L/100km have an inverse relationship — higher MPG means lower L/100km.
How to Use Fuel Economy Converter
- 1Enter a fuel economy value.
- 2Select the input unit.
- 3See all conversions instantly.
- 4Note the difference between US and UK gallons.
About Fuel Economy Converter
Convert between fuel economy units: MPG (US), MPG (UK/Imperial), liters per 100 km (L/100km), and kilometers per liter (km/L). Accounts for the inverse relationship between consumption and efficiency.
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 values are about 20% higher for the same fuel efficiency.
How do I convert MPG to L/100km?
L/100km = 235.215 ÷ MPG (US). The relationship is inverse — higher MPG means lower L/100km.