Finding out your real world MPG rating is great information to know. It allows you to compare your results to EPA MPG ratings and see any large difference that may indicate a vehicle problem. Perhaps it may point out any gas gobbling driving habits that you may have. It also allows for you to accurately budget your finances for gas. I’ve shown two methods below one if your using the metric system and one for imperial.

Using Miles and Gallons

You need to find out how many gallons of gas fits in your gas tank. You can do this by looking it up on the internet or by filling the gas up full when your gauge is empty, and recording the amount of gallons listed on the pump.

Then load the car with a full tank of gas, for most accurate results.

After that you need to get a starting point in which you can either use your trip meter, or odometer by recording the current mileage and end mileage.

Next you drive. Once your car has reached close to empty, take your mileage driven and divide it by the number of gallons it took to fill-up or your vehicles tank size that you found. This will give you your MPG.

Compare to EPA ratings.

Using Kilometers and Litres

You need to find out how many litres of gas fits in your gas tank. You can do this by looking it up on the internet or by filling the gas up full when your gauge is empty, and recording the amount of litres listed on the pump.

Then load the car with a full tank of gas, for most accurate results.

After that you need to get a starting point in which you can either use your trip meter, or odometer by recording the current mileage.

Next you drive. Once your car has reached close to empty, take your km driven and divide it by the number of litres it took to fill-up or your vehicles tank size that you found. This will give you litres per kilometer.

Now to convert this to MPG, multiply your litres per kilometer by 3.788 and 0.6 This is now your MPG rating.

Compare to EPA ratings.