10 Countries With Cheapest Petrol Prices

4. Qatar

Price per litre: 10.52

Cost per month: 1270.39

Petroleum is the cornerstone of Qatar's economy and accounts for more than 70 percent of total government revenue, more than 60 percent of gross domestic product, and roughly 85 percent of export earnings. Proved oil reserves of 15 billion barrels should ensure continued output at current levels for 23 years. Oil has given Qatar a per capita GDP that ranks among the highest in the world.

3. Saudi Arabia

Price per litre: 8.76

Cost per month: 1058.87

Proven oil reserves in Saudi Arabia are the second largest claimed in the world, estimated to be 267 billion barrels (Gbbl hereafter) including 2.5 Gbbl in the Saudi-Kuwaiti neutral zone. These reserves were the largest in the world until Venezuela announced they had increased their proven reserves to 297 Gbbl in January 2011. The Saudi owns about one-fifth of the world's total conventional oil reserves, a large fraction of these reserves comes from a small number of very large oil fields, and past production amounts to 40 percent of the stated reserves.