How to convert Miles per US gallon to kilometres per litre
km/L = mpg (US) × 0.425143707430272
Multiply the mpg (US) reading by 0.425143707430272. Both sides measure distance per fuel volume, so this is a direct scale conversion. US mpg uses a 3.785411784 L gallon.
Worked examples
30 mpg (US) ≈ 12.75431122 km/L
30 × 0.425143707430272 ≈ 12.75431122
50 mpg (US) ≈ 21.25718537 km/L
50 × 0.425143707430272 ≈ 21.25718537
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.