Some of the numbers in those charts look a bit off. The number for the US is definitely off in 2008-2009. In a lot of those countries the price of fuel is unregulated except for taxes and it seems these guys have just taken samples at distinct points in time. In 2008 there was a big spike in the price of oil over the summer and US prices reached $4.50/gallon (Rs. 53/L), then dropped as low as $1.25/gal (Rs. 15/L) when the price of oil collapsed in December. The crash was nicely timed. It happened during my winter break from law school and made the petrol bill for an 1800km multi-city trip to visit my parents and some friends much smaller. Not long into 2009 it was back up to the usual $2.50/gal. If you want an estimate for the US, it's been mostly varying between about $2.30 (Rs. 27/L) and $3.00 (Rs. 36/L) for years. I suspect some other countries also have prices listed on that chart that were affected by the 2008 oil price spike and crash.
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