In this photo taken with a long exposure, a pumping unit sucks oil from the ground near Greensburg, Kan. Tuesday, March 6, 2012. The nationwide average for regular unleaded slipped less

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In this photo taken with a long exposure, a pumping unit sucks oil from the ground near Greensburg, Kan. Tuesday, March 6, 2012. The nationwide average for regular unleaded slipped less than a penny to $3.764 per gallon on Tuesday, March 6,2012. That ended a streak of price hikes that began on Feb. 8. (AP Photo/Charlie Riedel) less