Where can I find reusable data about the current price of a litre of gasoline (not diesel) in various areas of the world?
Average price, or at least a reasonable approximation, for instance observed prices at a particular gasoline stand.
Must be CC-BY-SA or more permissive.
Try looking at Numbeo. It is a crowd source project on user contributed real-time data. The cost-of-living section has data on gasoline prices.
http://www.numbeo.com/cost-of-living/
Creative Commons Attribution-Sharealike 3.0 Unported License (CC-BY-SA) and GNU Free Documentation License (GFDL)
Wikipedia has the information for all countries:
Creative Commons Attribution-ShareAlike License
There is also http://www.globalpetrolprices.com/gasoline_prices/ but it has a much more restrictive BY-NC-ND license.
The World Bank provides data, but it is aggregated on the yearly level. Their source is German Agency for International Cooperation (GIZ).
Pump price for gasoline (US$ per liter)
Fuel prices refer to the pump prices of the most widely sold grade of gasoline. Prices have been converted from the local currency to U.S. dollars.
There is a download button for XML, CSV, or Excel.
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(handful of datasets have different license)
