How to convert Miles per Imperial gallon to kilometres per litre
km/L = mpg (UK) × 0.354006189934647
Multiply the mpg (UK) reading by 0.354006189934647. Both sides measure distance per fuel volume, so this is a direct scale conversion. Imperial mpg uses a 4.54609 L gallon.
Worked examples
30 mpg (UK) ≈ 10.6201857 km/L
30 × 0.354006189934647 ≈ 10.6201857
50 mpg (UK) ≈ 17.7003095 km/L
50 × 0.354006189934647 ≈ 17.7003095
Frequently asked questions
Why can a fuel-economy reading change without using less fuel?
Distance per litre and distance per gallon use different fuel-volume units. US and Imperial gallons also differ. A changed numerical reading after conversion describes the same economy.