How to Calculate Fuel Consumption per 100km

Calculating fuel consumption per 100 kilometers (km) is essential for understanding vehicle efficiency, planning trips, and comparing fuel economy. This guide explains the calculation method, provides a step-by-step formula, and includes an interactive calculator to determine your vehicle's fuel efficiency.

What is fuel consumption per 100km?

Fuel consumption per 100km (or miles per gallon in some countries) measures how efficiently a vehicle uses fuel. It indicates how many liters (or gallons) of fuel are required to travel 100 kilometers. Lower numbers mean better fuel efficiency.

This metric is widely used in Europe and other countries that use the metric system. In the US, fuel efficiency is often expressed in miles per gallon (MPG).

How to calculate fuel consumption per 100km

To calculate fuel consumption per 100km, you need to know the total distance traveled and the total amount of fuel used. Here's the step-by-step process:

Record the total distance traveled in kilometers.
Record the total amount of fuel used in liters.
Use the formula to calculate fuel consumption per 100km.

For example, if you traveled 500 kilometers and used 30 liters of fuel, your fuel consumption would be 6 liters per 100km.

The formula explained

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

This formula calculates how many liters of fuel are needed to travel 100 kilometers. The result is expressed in liters per 100 kilometers (L/100km).

For example, if you used 25 liters of fuel to travel 400 kilometers:

Fuel consumption = (25 ÷ 400) × 100 = 6.25 L/100km

Worked example

Let's say you filled up your car with 45 liters of fuel and drove 600 kilometers. Here's how to calculate your fuel consumption:

Total fuel used: 45 liters
Total distance traveled: 600 km
Calculation: (45 ÷ 600) × 100 = 7.5 L/100km

Your vehicle's fuel consumption is 7.5 liters per 100 kilometers.

Tip: For better accuracy, use a fuel consumption logbook or your vehicle's onboard computer to track fuel usage and distance.

Factors affecting fuel consumption

Several factors influence a vehicle's fuel consumption, including:

Driving conditions: City driving, highway driving, and aggressive acceleration all affect fuel efficiency.
Vehicle load: Carrying extra weight increases fuel consumption.
Tire pressure: Properly inflated tires improve fuel economy.
Engine maintenance: Regular servicing ensures optimal fuel efficiency.
Weather conditions: Cold weather can temporarily reduce fuel efficiency.

FAQ

What is a good fuel consumption per 100km?

A good fuel consumption depends on the vehicle type. For example, a small car might have a fuel consumption of 5-7 L/100km, while a large SUV might consume 8-12 L/100km. The lower the number, the better the fuel efficiency.

How can I improve my vehicle's fuel efficiency?

To improve fuel efficiency, maintain proper tire pressure, avoid aggressive driving, keep your vehicle well-maintained, and reduce unnecessary weight in the car.

Is fuel consumption per 100km the same as miles per gallon?

No, fuel consumption per 100km is used in metric countries, while miles per gallon (MPG) is used in the US. You can convert between the two using the formula: MPG ≈ 235.215 ÷ (L/100km).