UK vs US gallons
An imperial gallon is larger than a US gallon, so the MPG figures are not directly interchangeable.
TRAVEL & MOTORING
Fuel Economy Converter
Convert UK MPG, US MPG and litres per 100 km.
Converted fuel economy
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Enter your details to calculate.
Fuel Economy Converter guide
L/100 km
Lower litres per 100 km means better fuel economy.
MPG
Higher miles per gallon means better fuel economy.
Frequently asked questions
Is UK MPG the same as US MPG?
No. The gallons are different sizes, so the numeric MPG values differ.
Is lower L/100 km better?
Yes. It means fewer litres are used to travel 100 km.
Can I convert from any of the three units?
Yes. Choose the unit you already have and the calculator shows all three.