UnitsConverter.io

Fuel Consumption Unit Converter

Convert various units of fuel efficiency.

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Understanding Fuel Consumption Units

Fuel consumption (or fuel economy/efficiency) measures how much fuel a vehicle uses to travel a certain distance. Different regions and systems use various units, making comparisons sometimes tricky. This converter helps you easily switch between common formats.

Common Units:

  • MPG (US): Miles per US Gallon. Standard in the United States. Higher is better.
  • MPG (UK): Miles per Imperial Gallon. Used in the UK. The Imperial gallon is larger than the US gallon, so MPG (UK) values are higher than MPG (US) for the same efficiency. Higher is better.
  • km/L: Kilometers per Liter. Common metric unit. Higher is better.
  • L/100km: Liters per 100 Kilometers. Standard in Europe, Canada, Australia, etc. Measures fuel used over a distance, so lower is better.

Use the converter above to switch between these units accurately.

How to Use This Converter

  1. Enter Value: Type the fuel consumption value you want to convert into the input field.
  2. Select From Unit: Choose the unit of the value you entered from the dropdown list (e.g., 'MPG (US)').
  3. Select To Unit: Choose the unit you want to convert to from the second dropdown list (e.g., 'L/100km').
  4. View Result: The converted value will appear instantly.

Frequently Asked Questions about Fuel Consumption

What's the difference between MPG (US) and MPG (UK)?

The main difference is the size of the gallon used. The Imperial gallon (UK) is about 20% larger than the US gallon (4.546 liters vs 3.785 liters). Therefore, for the same vehicle, the MPG (UK) figure will always be higher than the MPG (US) figure because the car travels the same distance using a larger unit of fuel. Approximately, 1 MPG (UK) ≈ 1.201 MPG (US).

For fuel efficiency, is a higher or lower number better?

It depends on the unit:

  • For MPG (US), MPG (UK), and km/L: Higher is better (more distance per unit of fuel).
  • For L/100km: Lower is better (less fuel consumed per 100km).

How do I convert MPG (US) to L/100km?

Use the formula: L/100km ≈ 235.21 / MPG (US). Remember that MPG is higher-is-better, while L/100km is lower-is-better.

How do I convert MPG (UK) to L/100km?

Use the formula: L/100km ≈ 282.48 / MPG (UK).

How do I convert L/100km to MPG (US)?

Use the inverse formula: MPG (US) ≈ 235.21 / L/100km.

How do I convert L/100km to MPG (UK)?

Use the inverse formula: MPG (UK) ≈ 282.48 / L/100km.

How do I convert km/L to L/100km?

These units have an inverse relationship. Use the formula: L/100km = 100 / km/L. For example, 10 km/L is equal to 10 L/100km, and 20 km/L is equal to 5 L/100km.

How do I convert km/L to MPG (US)?

First, convert km/L to mi/L (mi/L ≈ km/L / 1.60934), then convert mi/L to MPG (US) (MPG (US) ≈ mi/L * 3.78541). Combined: MPG (US) ≈ (km/L / 1.60934) * 3.78541 or MPG (US) ≈ km/L * 2.3521.

Why are official fuel economy figures often different from real-world driving?

Official figures (like EPA ratings in the US) are obtained under standardized laboratory test cycles. Real-world driving conditions (traffic, terrain, weather, driving style, vehicle load, tire pressure, AC use) can significantly vary, leading to different actual fuel consumption.

What does 'combined' fuel economy mean?

It's typically a weighted average of the vehicle's fuel economy figures measured under simulated 'city' driving conditions (lower speeds, more stops/starts) and 'highway' driving conditions (higher speeds, fewer stops). The weighting often reflects typical driving patterns (e.g., 55% city / 45% highway in US EPA ratings).

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