Fuel Efficiency Converter

About This Tool

The Fuel Efficiency Converter supports conversion between L/100km, MPG (US), MPG (UK), km/L, mi/L, and L/100mi. Select the input unit, enter a value, and instantly see the result in all supported units.

Fuel efficiency measures how far a vehicle can travel per unit of fuel. The US and Canada primarily use MPG, while Europe and Asia use L/100km. UK MPG is based on the imperial gallon (4.546 L), larger than the US gallon (3.785 L).

How to Use

1. Select the unit you want to convert from.
2. Enter a value to instantly see the conversion in all units.
3. Check the Reference section for key conversion facts.

Reference

• 1 US MPG = 235.215 L/100km
• 1 UK MPG = 282.481 L/100km (UK gallon = 4.546 L)
• Higher MPG / km/L means more efficient; lower L/100km means more efficient
• 30 US MPG ≈ 7.84 L/100km ≈ 25.3 UK MPG

FAQ

• What is the difference between US MPG and UK MPG? — The UK gallon (4.546 L) is larger than the US gallon (3.785 L), so the same vehicle will show a higher MPG figure in UK units.
• Why is lower L/100km better? — L/100km measures fuel consumed per 100 km of travel. Less fuel consumed means a more efficient vehicle.