How do I track fuel used?
Fill up your tank, reset the trip odometer, then fill up again. The second fill amount is your fuel used.
Travel
Gas Mileage Calculator
Enter how far you drove and how much fuel you used to find out your actual fuel efficiency.
Live calculator output
Enter distance and fuel used to see your efficiency.
How it works
Fuel efficiency is calculated as: L/100 km = (Fuel Used / Distance) × 100, and km/L = Distance / Fuel Used. The result is also converted to US MPG using the factor: 1 km/L = 2.352 MPG. Lower L/100 km means better efficiency. This metric is used worldwide by automakers, fleet managers, and environmental agencies to compare vehicle performance.
Practical example
You drove 450 km and used 35 liters of fuel. L/100 km = (35/450) × 100 = 7.8. km/L = 450/35 = 12.9. MPG = 12.9 × 2.352 = 30.3. This is typical for a mid-size sedan. A hybrid might achieve 4-5 L/100 km, while a large SUV could use 12-15 L/100 km.
Frequently asked questions
Reusable FAQ content keeps each calculator page richer for users and search engines.
What is good fuel efficiency?
Under 6 L/100 km is considered efficient. Over 10 L/100 km is high consumption.
Why is my mileage different from the manufacturer spec?
Real-world driving includes traffic, weather, tire pressure, and driving style, all of which affect efficiency.
How can I improve my fuel efficiency?
Maintain proper tire pressure, avoid aggressive acceleration, use cruise control on highways, remove unnecessary weight, and keep up with engine maintenance.
Does AC affect fuel consumption?
Yes. Air conditioning can increase fuel consumption by 5-15%. At low speeds, open windows are more efficient. At highway speeds, AC is better than the drag from open windows.
Related calculators
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Estimate trip fuel usage and cost for one-way or round-trip journeys.
Carbon Footprint Calculator
Estimate driving CO2 emissions from distance and fuel consumption.
Travel Time Calculator
Estimate trip duration from distance and average speed.