I'm sure this subject has come across before... I was curious as to what everyone's average mileage per gallon is and have decided to make a poll out of it! If you want you can also list the exact amount. If you use imperial gallons 1.2 is equal to 1.0 gallons. If you use kilometers as a measurement then just know a mile is equal to 1.61 kilometers, a gallon is 3.88 liters, Multiply your mileage by 1.61 then multiply your gallons used by 3.88. If you use standard notation take your total amount of liters and divide it by 100 to get your conversion.