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Free MPG Calculator - Calculate Miles Per Gallon & Fuel Efficiency

Knowing your vehicle's actual miles per gallon (MPG) is crucial for understanding fuel efficiency and identifying potential maintenance issues. Our MPG calculator makes it easy to determine your real-world fuel economy by tracking your fill-ups over time. Simply record the miles driven between fill-ups and the gallons used, and we'll calculate your MPG instantly. Regular tracking helps you spot trends, such as declining efficiency that might indicate engine problems, tire issues, or the need for a tune-up. You can also track fill-up costs to monitor your fuel spending patterns. Our built-in history feature with visual charts lets you see how your MPG changes over time, helping you optimize your driving habits and maintain peak vehicle performance. When it's time to gauge how fuel economy impacts resale value, layer your findings with AssetDropper and set realistic savings targets through GoalSpark.

Please enter miles driven greater than 0

Please enter gallons used greater than 0

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Disclaimer: MPG calculations are estimates based on your input data. Actual fuel efficiency may vary based on driving conditions, vehicle maintenance, and other factors.

How to Use This Calculator

  1. Fill up your gas tank completely
  2. Note your current odometer reading
  3. Drive normally until your next fill-up
  4. Fill up your tank again and note the new odometer reading
  5. Calculate miles driven (new reading - old reading)
  6. Enter miles driven and gallons used in the calculator
  7. Optional: Enter the cost of your fill-up to track expenses
  8. Click "Add to Fill-Up History" to save and track over time

Pro Tip: Track your MPG over time to identify trends and catch potential maintenance issues early. A sudden drop in MPG could indicate engine problems or low tire pressure.