Convert fuel economy between countries
A US review quotes mpg, a Japanese catalog km/L, a European spec L/100km — the same efficiency in three dialects.
Tools used in this guide
The job
Comparing cars across markets needs one number in your own unit. Worse, L/100km runs backwards: lower is better, so 'it went from 8 to 6' is an improvement.
One value, four readings
Enter a number in US mpg, UK mpg, km/L, or L/100km and read all four. The UK gallon is bigger than the US one, so the same car shows a higher UK mpg.
Worked example
30 US mpg = 7.84 L/100km = 12.75 km/L ≈ 36 UK mpg. A car advertised at 5 L/100km is 47 US mpg — genuinely efficient.
Where it stops
This converts a rating — it doesn't measure yours. Real-world economy depends on driving; use the figure as a comparison point, not a promise.