Fuel Mileage Calculator

Enter your Starting Odometer Reading, Ending Odometer Reading (or Trip Distance directly), and Fuel Used to calculate your Fuel Efficiency in MPG or metric equivalents — plus your Cost per Mile and Total Trip Fuel Cost if you add a Fuel Price per Unit.

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Results

Fuel Efficiency

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Fuel Efficiency (Metric)

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Fuel Consumption

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Cost per Mile

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Total Trip Fuel Cost

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Fuel Efficiency Comparison

Frequently Asked Questions

How do I calculate miles per gallon (MPG)?

To calculate MPG, divide the distance traveled by the amount of fuel used. For example, if you drove 300 miles and used 12 gallons of gas, your MPG is 300 ÷ 12 = 25 MPG.

What's the difference between US and Imperial gallons?

A US gallon equals 3.785 liters, while an Imperial gallon equals 4.546 liters. Imperial gallons are used in the UK and some Commonwealth countries, making Imperial MPG calculations about 20% higher than US MPG for the same vehicle.

How can I improve my vehicle's gas mileage?

You can improve gas mileage by maintaining proper tire pressure, removing excess weight, avoiding aggressive driving, keeping up with regular maintenance, and using the recommended grade of motor oil for your vehicle.

What is L/100km and how does it relate to MPG?

Liters per 100 kilometers (L/100km) measures fuel consumption rather than efficiency. Lower L/100km numbers indicate better fuel economy. To convert from MPG to L/100km, use the formula: L/100km = 235.21 ÷ MPG (US).

Should I reset my trip odometer when calculating mileage?

Yes, resetting your trip odometer when you fill up makes it easier to track distance traveled. Record both odometer readings and the amount of fuel added for the most accurate mileage calculation.

Why might my calculated MPG differ from EPA ratings?

EPA ratings are laboratory estimates under controlled conditions. Real-world MPG can vary due to driving habits, traffic conditions, weather, vehicle maintenance, terrain, and use of accessories like air conditioning.

How often should I calculate my vehicle's fuel mileage?

Calculate your fuel mileage regularly, ideally every few fill-ups, to monitor your vehicle's performance. Sudden decreases in fuel efficiency may indicate maintenance issues that need attention.

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