How do you convert distance in miles into miles per gallon?

Answer 1

Fill the tank of your vehicle and write down the odometer reading. Let's say it reads 20,555 miles when you fill the tank. Now drive the vehicle until it has about 1/4 tank of fuel left. Fill the tank, and take note of the gallons required to fill it up. Let's say it took 13 gallons. Now look at the odometer reading. Let's say it now reads 20,840 miles. 20,840 - 20,555 = 285. Therefore you have driven 285 miles and burned 13 gallons of fuel. Now divide the 13 gallons into 285 miles driven. You end up with 21.923076. Which tells you that your vehicle got 22.9 MPG on that 13 gallons of fuel. Do this around 3 times under normal driving conditions, and you will have a good idea what the car averages.