Global petrol prices say in angola 1 gallon of regular gasoline is .980It isnt simple geography, it is just the tax who defines the price most at the end. At least I did guess that. In Switzerland are 57% tax on the fuel,,,
The world market is global, so the "clean" prices are nearby in most countrys.
If you are able to visit Angola, you will see that price per gallon: 0.758$