World Gas Prices Graph.
The US is colored in gray, countries in green have a lower gas price, countries in red - higher.
I think it's a good graph for the purpose that it was intended to serve (it does allow you to compare the information and see a lot of data in an easily-comprehensible way). However, there isn't enough information (no exact numbers, one can only guess, which is a direct violation of principles that we have learned in class).
http://flowingdata.com/2011/03/22/are-gas-prices-really-that-high/
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