Converters
Fuel Economy Converter
Convert between fuel economy units like MPG, L/100km, and km/L. Compare vehicle efficiency across American, European, and metric standards.
Result
7.84
Usage notes
- The US uses MPG (miles per US gallon). The UK uses MPG (miles per imperial gallon) — UK gallons are about 20% larger.
- L/100km is the European standard. Lower numbers mean better fuel economy.
- 30 MPG (US) ≈ 7.84 L/100km ≈ 12.75 km/L.
Related pages
How to Use This Tool
- 1Enter a fuel economy value in the input field.
- 2Select the source unit (From) and target unit (To).
- 3The converted value appears instantly. Use Swap to reverse the conversion.
Frequently Asked Questions
- What is the difference between US MPG and UK MPG?
- US gallons (3.785 L) are smaller than UK imperial gallons (4.546 L). So the same car will have a higher MPG number in UK units than in US units.
- How do I convert MPG to L/100km?
- Divide 235.215 by the US MPG value. For example, 30 MPG = 235.215 / 30 ≈ 7.84 L/100km.
- Why is L/100km inverted compared to MPG?
- MPG measures distance per unit of fuel (higher = better), while L/100km measures fuel per unit of distance (lower = better). They are reciprocal measures.
- What is good fuel economy?
- It varies by vehicle type. Generally, under 6 L/100km (over 39 MPG US) is considered excellent for passenger cars.