How much did gas cost in 2011?

January 2011 $3.09 per gallon February 2011 $3.17 per gallon March 2011 $3.55 per gallon April 2011 $3.82 per gallon May 2011 $3.93 per gallon June 2011 $3.70 per gallon July 2011 $3.65 per gallon August 2011 $3.63 per gallon September 2011 $3.61 per gallon October 2011 $3.47 per gallon November 2011 $3.42 per gallon December 2011 $3.28 per gallon