About this tool
Compute fuel economy from a measured distance and fuel consumed. Reports US MPG, European L/100 km, and km/L.
Formula
MPG = miles / gallons. L/100km = 235.215 / MPG. km/L = MPG · 0.4251.
Worked example
300 mi on 12 gal → 25 MPG ≈ 9.41 L/100 km ≈ 10.63 km/L.
Notes
L/100 km is inverted relative to MPG: lower is better. Going from 25 → 50 MPG saves more fuel per mile than going from 50 → 75 MPG.