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Re:What is up with U.S. retail gasoline deliveries? by nostrademons on Saturday September 08, 2012 @11:34PM (#4494822)
Alternatively, you can credit both the fuel economy increase and the cut-back in driving on higher gas prices, which can in turn be credited to rising global demand for gasoline.
Re:What is up with U.S. retail gasoline deliveries? by dredmorbius on Sunday September 09, 2012 @01:10AM (#4495014)
Prices can rise in response to both rising demand and falling supply.

Given that we're within the window of peak oil forecasts, and demand (particularly in India and China) has been rising, it's very likely both.