Fuel Economy Converter

US and UK gallons are different sizes. A US gallon is 3.785 liters, while a UK (Imperial) gallon is 4.546 liters. This means a car rated at 30 MPG US actually gets about 36 MPG UK, even though it is the same car using the same amount of fuel. To convert US MPG to UK MPG, multiply by 1.20095.

To convert US MPG to liters per 100 kilometers (L/100km), divide 235.215 by the MPG value. For example, 30 MPG (US) = 235.215 / 30 = 7.84 L/100km. To convert L/100km back to US MPG, divide 235.215 by the L/100km value.

L/100km directly shows fuel consumption — how much fuel you use per distance driven. If your car uses 8 L/100km and you drive 100 km, you know you need 8 liters of fuel. MPG is an efficiency measure where higher is better, while L/100km is a consumption measure where lower is better. Most of the world (Europe, Asia, South America) uses L/100km, while the US and UK traditionally use MPG.

To convert kilometers per liter (km/L) to liters per 100 kilometers (L/100km), divide 100 by the km/L value. For example, 12.5 km/L = 100 / 12.5 = 8 L/100km. To convert L/100km to km/L, also divide 100 by the L/100km value: 8 L/100km = 100 / 8 = 12.5 km/L.