Is Fuel Efficiency Converter free?

Yes, completely free. All conversions happen locally in your browser.

How do I convert MPG to L/100km?

US gallon: L/100km = 235.215 / MPG. UK gallon: L/100km = 282.481 / MPG. For example, 30 MPG (US) ≈ 7.84 L/100km. This tool handles it automatically.

What is the difference between US and UK gallons?

US gallon ≈ 3.785 L. UK (Imperial) gallon ≈ 4.546 L. The US uses US gallons, the UK and Commonwealth use Imperial gallons. The same MPG value gives higher efficiency with UK gallons.

What is considered good fuel efficiency?

L/100km: under 6 = excellent (hybrid/EV), 6-8 = good, 8-10 = average, 10-12 = high, 12+ = very high. MPG (US): 40+ = excellent, 30-40 = good, 20-30 = average.

How do km/L and L/100km relate?

They are inversely related: km/L = 100 / (L/100km). For example, 10 km/L = 10 L/100km, and 20 km/L = 5 L/100km.

Does this tool upload my data?

No. All conversions are done locally in your browser. No data is uploaded to any server.

Free Fuel Efficiency Converter - MPG/km/L/L/100km Online ...

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Updated: 2026-07-11

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📖 How to Use

Enter a fuel efficiency value and select its unit. The tool converts it between MPG (US/UK), km/L, and L/100km.

⛽ Fuel Efficiency Converter

📖 How to Use