Calculate your vehicle's Miles Per Gallon (MPG) or Liters Per 100 Kilometers (L/100km).
Your Fuel Efficiency:
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Understanding Fuel Efficiency
Fuel efficiency is a critical metric for understanding how far your vehicle can travel on a given amount of fuel. It's a key factor in determining your transportation costs and environmental impact. The most common measures are Miles Per Gallon (MPG) in the United States and Liters per 100 Kilometers (L/100km) in many other parts of the world.
Miles Per Gallon (MPG)
MPG is calculated by dividing the total distance traveled by the amount of fuel consumed. A higher MPG indicates better fuel efficiency, meaning you travel further on less fuel.
For example, if you drive 300 miles and use 10 gallons of fuel, your MPG is:
300 miles / 10 gallons = 30 MPG
A higher MPG means your vehicle is more efficient, saving you money on fuel and reducing your carbon footprint.
Liters per 100 Kilometers (L/100km)
In many countries outside the US, fuel efficiency is expressed as Liters per 100 Kilometers (L/100km). This measure indicates how many liters of fuel your vehicle consumes to travel 100 kilometers. A lower L/100km value signifies better fuel efficiency.
To convert MPG to L/100km, you can use the following conversion factors (approximately):
1 US Gallon ≈ 3.78541 Liters
1 Mile ≈ 1.60934 Kilometers
The conversion formula is:
L/100km = (3.78541 * 100) / (MPG * 1.60934)
Or simplified:
L/100km ≈ 235.215 / MPG
For example, a vehicle with 30 MPG would have an L/100km rating of approximately:
235.215 / 30 ≈ 7.84 L/100km
Why Track Your Fuel Efficiency?
Save Money: Monitoring MPG helps you identify changes in your vehicle's performance that might indicate a problem, or simply track the effectiveness of fuel-saving driving habits.
Environmental Impact: Better fuel efficiency means lower fuel consumption, which translates to reduced emissions and a smaller carbon footprint.
Vehicle Maintenance: A sudden drop in MPG can be an early indicator of maintenance issues such as clogged air filters, incorrect tire pressure, or engine problems.
Informed Purchasing Decisions: Knowing MPG figures helps you compare different vehicles and make more informed decisions when buying a new or used car.
Regularly using this calculator can empower you to manage your driving costs and environmental impact more effectively.
function calculateFuelEfficiency() {
var distanceInput = document.getElementById("distance");
var fuelConsumedInput = document.getElementById("fuel_consumed");
var resultValueSpan = document.getElementById("result-value");
var resultUnitSpan = document.getElementById("result-unit");
var distance = parseFloat(distanceInput.value);
var fuelConsumed = parseFloat(fuelConsumedInput.value);
// Clear previous results
resultValueSpan.textContent = "–";
resultUnitSpan.textContent = "–";
if (isNaN(distance) || isNaN(fuelConsumed)) {
alert("Please enter valid numbers for distance and fuel consumed.");
return;
}
if (distance <= 0 || fuelConsumed <= 0) {
alert("Distance driven and fuel consumed must be greater than zero.");
return;
}
var mpg = distance / fuelConsumed;
resultValueSpan.textContent = mpg.toFixed(2); // Display MPG rounded to 2 decimal places
resultUnitSpan.textContent = "MPG";
}