Fuel Economy (MPG) Calculator
Enter the miles driven and gallons of fuel used between two fill-ups to calculate your car's fuel economy.
Fuel Economy (MPG) Calculator
Calculate your vehicle's real-world fuel economy in miles per gallon using the fill-up method.
This calculator provides an estimate for general informational purposes only. It is not a substitute for professional financial, mechanical or engineering advice.
The fill-up method is the most accurate way to measure your actual fuel economy: divide the miles driven since your last full tank by the gallons needed to fill it up again.
Example
- With the default values shown above, this calculator returns: Miles per Gallon (MPG) ≈ 30.00.
Frequently Asked Questions
How do I measure miles driven and gallons used?
Fill your tank completely, reset your trip odometer, drive normally, then fill up completely again. The trip odometer reading is your miles driven, and the amount needed to refill the tank is your gallons used.
Why does my MPG vary between fill-ups?
Driving style, terrain, weather, traffic and tire pressure all affect real-world fuel economy, so it's normal to see some variation between tanks.