Complaining about petrol prices is a national sport, but it's an international problem. This infographic, compiled by car tech blog Between The Axles, reminds us that no matter how badly off we think we are, it could be worse. We're not paying $2.14 a litre like the Norwegians.
Unfortunately, petrol isn't something we can import for less or pirate across peer-to-peer networks (unlike books or music), so we can't exploit those cheaper South American prices. Indeed, despite that quoted average cost, pricing isn't even consistent between different states or in different cities depending on the day of the week. As well, the global figures on their own aren't meaningful; cheaper petrol in Africa won't help much if you're only earning a few dollars a day. Average disposable income matters just as much as the sticker price.
Ultimately, if you want to save money on petrol, you need to purchase a more efficient car and drive less. Nothing else will help much.
How much is a litre of unleaded petrol around the world? [Between The Axles]