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Fuel Efficiency Converter

Convert between MPG (US/UK), L/100km, km/L, and miles per liter.

Value

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Note: L/100km is an inverse measure — lower is more efficient. MPG and km/L are direct — higher is better.

Real-World Benchmarks

Efficient small car 35–45 MPG (US) / 6–7 L/100km

Average sedan 25–35 MPG (US) / 7–9 L/100km

Large SUV/Truck 15–22 MPG (US) / 11–16 L/100km

Toyota Prius hybrid ≈52 MPG (US) / 4.5 L/100km

Frequently Asked Questions

Why is UK MPG higher than US MPG for the same car?▼

A UK gallon (imperial gallon) is 4.546 liters, while a US gallon is 3.785 liters — about 20% larger. The same car that gets 30 US MPG would show about 36 UK MPG. Always check which standard is being used when comparing fuel economy.

How do you convert MPG to L/100km?▼

To convert US MPG to L/100km: divide 235.21 by the MPG value. For example, 30 MPG = 235.21 ÷ 30 = 7.84 L/100km. For UK MPG, use 282.48 as the conversion constant.

Is lower L/100km better?▼

Yes — L/100km measures how many liters of fuel you need per 100 kilometers, so lower is more efficient. It is the opposite of MPG or km/L, where higher is better. L/100km is standard in Europe, Canada, and Australia.

What is a good L/100km for a new car?▼

Under 6 L/100km is excellent (equivalent to about 39+ US MPG). 6–8 L/100km is good for a non-hybrid. 8–11 L/100km is average. Over 12 L/100km is considered poor fuel economy for a modern vehicle.

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