Fun idea for a quiz. I got all of them except Turkmenistan. I live in Saudi Arabia, though, and the price of gas is only 45 cents/gallon, not 60. 60 is for premium. The price is fixed and set by the government. I thought the only place with cheaper gas was Venezuela... but.. only 8 cents? I thought it was at least 15 or 25. I think I remember reading that before.
Yes I was also surprised about Venezuela., but it looks that it is indeed really than cheap there. The prices from this quiz were in 2010. I am not sure how it evolved these days. Therefore, you might be right when you say that for Saudi Arabia the price is different now.