Petrol and diesel are least affordable to the average citizen in India among the 10 largest economies of the world. An average Indian — someone whose income matches the country's per capita — can buy only about 8 litres of petrol or diesel with their daily income, while the average American can buy 199 litres of petrol or 171 litres of diesel. These numbers have been arrived at by comparing the petrol and diesel prices in each country on May 25, which are collated by GlobalPetrolPrices.com.