Nexus Web Tools

Fuel Consumption Converter

Convert between L/100km, MPG (US), MPG (imperial), and km/L.

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Background

Fuel consumption: L/100km (AU/EU), MPG (US/UK), km/L (Japan/India). Higher MPG = better, but lower L/100km = better. Inverse relationship makes comparison unintuitive.

The Inverse Relationship

7 L/100km ≈ 33.6 MPG (US) or 40.4 MPG (imp). Small improvements at high consumption save more fuel.

US vs Imperial MPG

US gallon = 3.785 L; imperial = 4.546 L. 40 MPG (imp) ≈ 33.3 MPG (US). Always verify which gallon.

How to Use This Calculator

  1. Select 'Fuel'

    Choose the category from the dropdown.

  2. Select your source unit

    Pick the unit you're converting from.

  3. Enter the value

    Type the number. Results update instantly.

  4. Select your target unit

    Choose the unit you need.

Applications

Vehicle Comparison

5 L/100km ≈ 47 MPG (US). Understanding both helps read international reviews.

Fleet Cost Estimation

8 L/100km × 15,000 km/yr × $1.80/L ≈ $2,160/yr.

Trip Planning

1,500 km at 7 L/100km = 105 L of fuel needed.

Frequently Asked Questions

How do you convert L/100km to MPG?

US: 235.215 ÷ L/100km. 8 L/100km = 29.4 MPG (US). Imperial: 282.481 ÷ L/100km.

How do you convert MPG to L/100km?

US: 235.215 ÷ MPG. 30 MPG = 7.84 L/100km.

What is good fuel economy?

Under 7 L/100km is efficient (petrol). Hybrids: 4–5 L/100km. EVs: 15–20 kWh/100km.