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Allintitle:how Do You Calculate Fuel Consumption in Litres per 100km

Reviewed by Calculator Editorial Team

Calculating fuel consumption in litres per 100km (L/100km) is a standard way to compare vehicle efficiency. This metric shows how much fuel a vehicle uses to travel 100 kilometers, making it easier to compare different cars or driving conditions.

What is litres per 100km?

Litres per 100 kilometers (L/100km) is a common fuel efficiency metric used in many countries, particularly in Europe. It represents the amount of fuel a vehicle consumes to travel 100 kilometers. Lower numbers indicate better fuel efficiency.

This metric is often used alongside miles per gallon (mpg) in the US, but L/100km provides a more direct comparison of fuel consumption rates between vehicles.

Note: Some countries use litres per 100 miles (L/100mi) instead. The conversion between these units is approximately 1 L/100km = 0.621 L/100mi.

How to calculate fuel consumption

To calculate fuel consumption in litres per 100km, you need to know two key pieces of information:

  1. The total amount of fuel used (in litres)
  2. The total distance traveled (in kilometers)

The basic formula is:

Fuel consumption (L/100km) = (Total fuel used ÷ Total distance traveled) × 100

This formula works by first finding the fuel consumption per kilometer, then scaling it up to 100 kilometers for easier comparison.

Step-by-step calculation

  1. Record the total amount of fuel you've used (in litres)
  2. Record the total distance you've traveled (in kilometers)
  3. Divide the total fuel used by the total distance traveled
  4. Multiply the result by 100 to get litres per 100km

Example calculation

Let's say you filled up your car with 45 litres of fuel and drove 500 kilometers. Here's how to calculate your fuel consumption:

Fuel consumption = (45 L ÷ 500 km) × 100 = 9 L/100km

This means your vehicle used 9 litres of fuel to travel 100 kilometers.

For comparison, a typical compact car might have a fuel consumption of around 7-9 L/100km, while a larger SUV might use 10-15 L/100km.

Factors affecting fuel consumption

Several factors can influence a vehicle's fuel consumption:

  • Driving conditions: City driving, highway driving, and stop-and-go traffic all affect fuel efficiency
  • Vehicle load: More passengers or cargo can increase fuel consumption
  • Driving speed: Driving too fast or too slow can reduce efficiency
  • Road conditions: Hilly terrain or rough roads can increase fuel use
  • Vehicle maintenance: Properly maintained vehicles typically have better fuel efficiency

Understanding these factors can help you improve your vehicle's fuel efficiency and save money on fuel costs.

Comparing vehicles

When comparing vehicles, it's important to consider several factors:

  • Fuel consumption: Lower L/100km numbers are generally better
  • Fuel type: Diesel vehicles often have better fuel efficiency than petrol vehicles
  • Engine size: Smaller engines typically use less fuel
  • Transmission type: Automatic transmissions may have slightly higher fuel consumption
  • Driving style: Aggressive driving can significantly increase fuel consumption

Using the litres per 100km metric helps you make more informed decisions when choosing a vehicle or comparing fuel efficiency between different models.

FAQ

How do I convert litres per 100km to miles per gallon?
To convert L/100km to mpg, use this formula: mpg = 235.215 ÷ (L/100km). For example, 7 L/100km converts to approximately 33.6 mpg.
Is litres per 100km the same as kilometres per litre?
No, they are inversely related. Kilometres per litre (km/L) shows how many kilometers you can travel with one litre of fuel. To convert between them, simply take the reciprocal: km/L = 100 ÷ (L/100km).
Why do some countries use litres per 100 miles instead?
Some countries, particularly in the US and UK, use litres per 100 miles (L/100mi) because they use the imperial measurement system. The conversion is approximately 1 L/100km = 0.621 L/100mi.
How can I improve my vehicle's fuel efficiency?
Regular maintenance, proper tire inflation, smooth driving, avoiding aggressive acceleration, and using cruise control can all help improve fuel efficiency.