calculate car petrol cost
Numbeo allows you to calculate gas prices and gas consumption using information about: 1  fuel efficiency (car consumption for 100km or miles per gallon). 2  distance you are planning to travel (or cities which you intend to visit on your journey).y using car consumption and travel distance, our tool shows you approximately how much gasoline (petrol) your car will consume, an approximate price and also estimates how much will your car depreciate during that trip.