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Convert fuel efficiency between MPG (US), MPG (Imperial), L/100km, and km/L. Optionally estimate trip fuel cost.
Trip Cost (optional)
Fuel Efficiency Conversions:
MPG (US) = 235.214 / L/100km
MPG (Imperial) = 282.481 / L/100km
km/L = 100 / L/100km
L/100km is the common base for all conversions. Trip cost = (distance / 100) x L/100km x price per liter.
A US gallon is 3.785 liters while an Imperial (UK) gallon is 4.546 liters. This means Imperial MPG figures are always higher — a car rated at 30 US MPG gets about 36 Imperial MPG.
Lower is better. L/100km measures how many liters of fuel are consumed per 100 kilometers. A car using 5 L/100km is more fuel-efficient than one using 10 L/100km.
For a modern passenger car, 30+ US MPG (7.8 L/100km or less) is considered good. Hybrid vehicles often achieve 50+ MPG. Most fuel-efficient EVs are rated in MPGe (miles per gallon equivalent).
Divide 235.214 by the MPG (US) figure. For example, 30 MPG = 235.214 / 30 = 7.84 L/100km. For Imperial MPG, divide 282.481 by the MPG figure.
km/L (kilometers per liter) is the same concept as MPG but using metric units. It is commonly used in Japan, India, and some Latin American countries. 1 US MPG ≈ 0.425 km/L.
Trip Cost = (Distance in km / 100) x L/100km x Price per liter. If your distance is in miles, it is first converted to km (1 mile = 1.60934 km). If your price is per gallon, it is divided by 3.78541 to get the per-liter price.