Fuel Economy Converter
Convert fuel economy between Australian litres per 100km, miles per gallon and kilometres per litre for comparing vehicles.
Your results
Calculation breakdown
- L/100km to mpg (UK)
- mpg (UK) = 282.48 ÷ L/100km
- L/100km to mpg (US)
- mpg (US) = 235.21 ÷ L/100km
Worked example
A car rated at 7 L/100km is approximately 40.35 mpg (UK) or 33.6 mpg (US).
Assumptions
- Uses standard imperial and US gallon conversion constants for fuel economy.
- Treats US and UK gallons as different sizes, matching real-world label differences.
How this calculator works
This calculator converts fuel economy figures between Australia's standard litres per 100 kilometres, miles per gallon (US or UK) and kilometres per litre. It is useful when comparing an Australian car's fuel consumption rating against imported vehicle specifications quoted in mpg.
Frequently asked questions
What fuel economy unit does Australia use?
Australian vehicle fuel economy labels use litres per 100 kilometres (L/100km), where a lower number means better efficiency.
Is US mpg the same as UK mpg?
No, they differ because a US gallon and a UK (imperial) gallon are different sizes, so this calculator treats them as separate units.
Why does a lower L/100km mean better efficiency but a higher mpg does too?
L/100km measures fuel used per fixed distance, so lower is better, while mpg measures distance per fixed fuel amount, so higher is better.