How to Calculate Miles Per Gallon (MPG)?

To calculate miles per gallon (MPG), divide the number of miles driven by the gallons of fuel consumed. For example, if your car travels 300 miles using 10 gallons of gasoline, its fuel economy is 30 MPG.
MPG is a standard measure of vehicle fuel efficiency in the United States. A higher MPG generally means a vehicle travels farther on each gallon of fuel.
What Is the MPG Formula?
The basic formula is:
MPG=
Gallons of Fuel Used
Miles Driven ​
Where:
Miles driven: The distance traveled during the trip or between fill-ups.
Gallons of fuel used: The amount of gasoline consumed over that distance.
MPG: The average number of miles traveled per gallon of fuel.
For an accurate real-world measurement, record the odometer reading and fuel quantity over the same driving period.